TY  - JOUR
AU  - Šaponjić, Aleksandra
AU  - Šaponjić, Đorđe
AU  - Perović, Ivana
AU  - Vuković, Marina
AU  - Nikolić, Vladimir
AU  - Kaninski, Milica Marčeta
AU  - Kokunešoski, Maja
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3700
AB  - Co-Mo carbides were prepared by impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. Bimetallic Co-Mo carbide obtained by using carbothermal hydrogen reduction of Co-Mo precursors is formed when the Co-Mo molar ratio is 1.0. The obtained samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. Electrochemical characterization of obtained materials wеre performed by cyclic voltammetry in acid solution.
PB  - International Institute for the Science of Sintering (IISS)
T2  - Science of Sintering
T1  - Synthesis and characterization of co-mo bimetallic carbides
VL  - 51
IS  - 3
SP  - 319
EP  - 326
DO  - 10.2298/SOS1903319S
ER  - 

@article{
author = "Šaponjić, Aleksandra and Šaponjić, Đorđe and Perović, Ivana and Vuković, Marina and Nikolić, Vladimir and Kaninski, Milica Marčeta and Kokunešoski, Maja",
year = "2019",
abstract = "Co-Mo carbides were prepared by impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. Bimetallic Co-Mo carbide obtained by using carbothermal hydrogen reduction of Co-Mo precursors is formed when the Co-Mo molar ratio is 1.0. The obtained samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. Electrochemical characterization of obtained materials wеre performed by cyclic voltammetry in acid solution.",
publisher = "International Institute for the Science of Sintering (IISS)",
journal = "Science of Sintering",
title = "Synthesis and characterization of co-mo bimetallic carbides",
volume = "51",
number = "3",
pages = "319-326",
doi = "10.2298/SOS1903319S"
}

Šaponjić, A., Šaponjić, Đ., Perović, I., Vuković, M., Nikolić, V., Kaninski, M. M.,& Kokunešoski, M.. (2019). Synthesis and characterization of co-mo bimetallic carbides. in Science of Sintering
International Institute for the Science of Sintering (IISS)., 51(3), 319-326.
https://doi.org/10.2298/SOS1903319S

Šaponjić A, Šaponjić Đ, Perović I, Vuković M, Nikolić V, Kaninski MM, Kokunešoski M. Synthesis and characterization of co-mo bimetallic carbides. in Science of Sintering. 2019;51(3):319-326.
doi:10.2298/SOS1903319S .

Šaponjić, Aleksandra, Šaponjić, Đorđe, Perović, Ivana, Vuković, Marina, Nikolić, Vladimir, Kaninski, Milica Marčeta, Kokunešoski, Maja, "Synthesis and characterization of co-mo bimetallic carbides" in Science of Sintering, 51, no. 3 (2019):319-326,
https://doi.org/10.2298/SOS1903319S . .

TY  - CONF
AU  - Lončarević, Branka D.
AU  - Nikolić, Vladimir
AU  - Lugonja, Nikoleta
AU  - Randjelović, Danijela
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica
AU  - Beškoski, Vladimir
PY  - 2018
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5426
AB  - The numerous naturally occurring biopolymeric materials are used as edible films and coatings (lipids, proteins, and polysaccharides). Microbial levan and pullulan have been already considered as biopolymers in food industry. The aim of this work was to obtain the levan and levan/pullulan blend films and compare them using the Atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). Two different films compositions were prepared by casting method: levan and levan/pullulan in the proportions 1:1. AFM measurements showed that levan film had a smoother surface and, consequently, a lower degree of roughness comparing to the levan/pullulan blend films. FTIR spectra showed peaks, which corresponded to all components of the obtained films.
PB  - Belgrade :  Society of Physical Chemists of Serbia
C3  - Proceedings - 6th Workshop Specific Methods for Food Safety and Quality
T1  - Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization
SP  - 33
EP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_cer_3983
ER  - 

@conference{
author = "Lončarević, Branka D. and Nikolić, Vladimir and Lugonja, Nikoleta and Randjelović, Danijela and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica and Beškoski, Vladimir",
year = "2018",
abstract = "The numerous naturally occurring biopolymeric materials are used as edible films and coatings (lipids, proteins, and polysaccharides). Microbial levan and pullulan have been already considered as biopolymers in food industry. The aim of this work was to obtain the levan and levan/pullulan blend films and compare them using the Atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). Two different films compositions were prepared by casting method: levan and levan/pullulan in the proportions 1:1. AFM measurements showed that levan film had a smoother surface and, consequently, a lower degree of roughness comparing to the levan/pullulan blend films. FTIR spectra showed peaks, which corresponded to all components of the obtained films.",
publisher = "Belgrade :  Society of Physical Chemists of Serbia",
journal = "Proceedings - 6th Workshop Specific Methods for Food Safety and Quality",
title = "Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization",
pages = "33-36",
url = "https://hdl.handle.net/21.15107/rcub_cer_3983"
}

Lončarević, B. D., Nikolić, V., Lugonja, N., Randjelović, D., Gojgić-Cvijović, G. D., Jakovljević, D.,& Beškoski, V.. (2018). Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization. in Proceedings - 6th Workshop Specific Methods for Food Safety and Quality
Belgrade :  Society of Physical Chemists of Serbia., 33-36.
https://hdl.handle.net/21.15107/rcub_cer_3983

Lončarević BD, Nikolić V, Lugonja N, Randjelović D, Gojgić-Cvijović GD, Jakovljević D, Beškoski V. Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization. in Proceedings - 6th Workshop Specific Methods for Food Safety and Quality. 2018;:33-36.
https://hdl.handle.net/21.15107/rcub_cer_3983 .

Lončarević, Branka D., Nikolić, Vladimir, Lugonja, Nikoleta, Randjelović, Danijela, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica, Beškoski, Vladimir, "Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization" in Proceedings - 6th Workshop Specific Methods for Food Safety and Quality (2018):33-36,
https://hdl.handle.net/21.15107/rcub_cer_3983 .

TY  - CONF
AU  - Lončarević, Branka D.
AU  - Nikolić, Vladimir
AU  - Lugonja, Nikoleta
AU  - Randjelović, Danijela
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica
AU  - Beškoski, Vladimir
PY  - 2018
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5427
AB  - Poster presented at 6th Workshop Specific Methods for Food Safety and Quality, 2018
T1  - Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization
UR  - https://hdl.handle.net/21.15107/rcub_cer_3984
ER  - 

@conference{
author = "Lončarević, Branka D. and Nikolić, Vladimir and Lugonja, Nikoleta and Randjelović, Danijela and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica and Beškoski, Vladimir",
year = "2018",
abstract = "Poster presented at 6th Workshop Specific Methods for Food Safety and Quality, 2018",
title = "Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization",
url = "https://hdl.handle.net/21.15107/rcub_cer_3984"
}

Lončarević, B. D., Nikolić, V., Lugonja, N., Randjelović, D., Gojgić-Cvijović, G. D., Jakovljević, D.,& Beškoski, V.. (2018). Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization. .
https://hdl.handle.net/21.15107/rcub_cer_3984

Lončarević BD, Nikolić V, Lugonja N, Randjelović D, Gojgić-Cvijović GD, Jakovljević D, Beškoski V. Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization. 2018;.
https://hdl.handle.net/21.15107/rcub_cer_3984 .

Lončarević, Branka D., Nikolić, Vladimir, Lugonja, Nikoleta, Randjelović, Danijela, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica, Beškoski, Vladimir, "Levan and Levan/Pullulan Blend Films: AFM and FTIR Spectroscopy Characterization" (2018),
https://hdl.handle.net/21.15107/rcub_cer_3984 .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Lončarević, Branka D.
AU  - Popović, Aleksandar R.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/341
AB  - Biodegradation of methacrylic acid and starch graft copolymers was investigated for the first time in this manuscript. Synthesized copolymer was characterized by 1H nuclear magnetic resonance spectroscopy (NMR), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and elemental analysis. Copolymers with different percentage of grafting, G (%), were buried in three different types of soil. Biodegradation was monitored by measuring mass loss of the samples and using FTIR and SEM. The highest weight loss was in soil for the orchid growth (all samples had biodegradation higher than 89%), followed by soil for the cactus growth (mass loss higher than 70%) and soil rich in humus where some of the samples had biodegradation rate near or less than 50%. The correlation between G (%) and percent of weight loss after biodegradation was not significant in any types of soil. FTIR and SEM showed that after biodegradation, samples still contained both building components. Respiration test showed higher O2 consumption and CO2 production comparing to polystyrene which confirmed biodegradability of the accessible starch in copolymer. Based on the obtained results, degradation mechanism is proposed. First step is biodegradation of easily accessible starch followed by dissolution of the poly(methacrylic acid). This mechanism confirmed that biodegradation depends not only on the percentage of grafting, but also on molecular packaging, chains arrangement and the number and types of microorganisms present in the specific types of soils. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
T2  - Polymer Bulletin
T1  - Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch
DO  - 10.1007/s00289-018-2484-x
ER  - 

@article{
author = "Nikolić, Vladimir and Lončarević, Branka D. and Popović, Aleksandar R.",
year = "2018",
abstract = "Biodegradation of methacrylic acid and starch graft copolymers was investigated for the first time in this manuscript. Synthesized copolymer was characterized by 1H nuclear magnetic resonance spectroscopy (NMR), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and elemental analysis. Copolymers with different percentage of grafting, G (%), were buried in three different types of soil. Biodegradation was monitored by measuring mass loss of the samples and using FTIR and SEM. The highest weight loss was in soil for the orchid growth (all samples had biodegradation higher than 89%), followed by soil for the cactus growth (mass loss higher than 70%) and soil rich in humus where some of the samples had biodegradation rate near or less than 50%. The correlation between G (%) and percent of weight loss after biodegradation was not significant in any types of soil. FTIR and SEM showed that after biodegradation, samples still contained both building components. Respiration test showed higher O2 consumption and CO2 production comparing to polystyrene which confirmed biodegradability of the accessible starch in copolymer. Based on the obtained results, degradation mechanism is proposed. First step is biodegradation of easily accessible starch followed by dissolution of the poly(methacrylic acid). This mechanism confirmed that biodegradation depends not only on the percentage of grafting, but also on molecular packaging, chains arrangement and the number and types of microorganisms present in the specific types of soils. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.",
journal = "Polymer Bulletin",
title = "Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch",
doi = "10.1007/s00289-018-2484-x"
}

Nikolić, V., Lončarević, B. D.,& Popović, A. R.. (2018). Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch. in Polymer Bulletin.
https://doi.org/10.1007/s00289-018-2484-x

Nikolić V, Lončarević BD, Popović AR. Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch. in Polymer Bulletin. 2018;.
doi:10.1007/s00289-018-2484-x .

Nikolić, Vladimir, Lončarević, Branka D., Popović, Aleksandar R., "Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch" in Polymer Bulletin (2018),
https://doi.org/10.1007/s00289-018-2484-x . .

TY  - DATA
AU  - Nikolić, Vladimir
AU  - Lončarević, Branka D.
AU  - Popović, Aleksandar R.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3175
T2  - Polymer Bulletin
T1  - Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting  Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197–2213.  https://doi.org/10.1007/s00289-018-2484-x
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3175
ER  - 

@misc{
author = "Nikolić, Vladimir and Lončarević, Branka D. and Popović, Aleksandar R.",
year = "2018",
journal = "Polymer Bulletin",
title = "Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting  Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197–2213.  https://doi.org/10.1007/s00289-018-2484-x",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3175"
}

Nikolić, V., Lončarević, B. D.,& Popović, A. R.. (2018). Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting  Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197–2213.  https://doi.org/10.1007/s00289-018-2484-x. in Polymer Bulletin.
https://hdl.handle.net/21.15107/rcub_cherry_3175

Nikolić V, Lončarević BD, Popović AR. Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting  Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197–2213.  https://doi.org/10.1007/s00289-018-2484-x. in Polymer Bulletin. 2018;.
https://hdl.handle.net/21.15107/rcub_cherry_3175 .

Nikolić, Vladimir, Lončarević, Branka D., Popović, Aleksandar R., "Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting  Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197–2213.  https://doi.org/10.1007/s00289-018-2484-x" in Polymer Bulletin (2018),
https://hdl.handle.net/21.15107/rcub_cherry_3175 .

TY  - CONF
AU  - Kekez, Branka
AU  - Nikolić, Vladimir
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica
AU  - Beškoski, Vladimir
AU  - Vrvić, Miroslav
PY  - 2017
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5432
AB  - Cilj ovog rada je bio izolovati i upotrebiti mikrobni levan za sintezu novog tipa kalemljenog kopolimera sa stirenom i ispitati uticaj aminoaktivatora na reakciju kalemljenja.
AB  - The aim of this study was to isolate and use microbial levan for the synthesis of a new type of grafted copolymer with styrene and to investigate the influence of amino activators on the grafting reaction.
PB  - Beograd : Udruženje mikrobioologa Srbije
C3  - Kongres mikrobiologa Srbije, Mikromed 2017, Knjiga apstrakata,  Beograd, 11-13 maj 2017.
T1  - Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju
T1  - Microbial polysaccharide levan and polystyren in grafting reaction including amine activators
SP  - 154
EP  - 155
UR  - https://hdl.handle.net/21.15107/rcub_cer_5041
ER  - 

@conference{
author = "Kekez, Branka and Nikolić, Vladimir and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica and Beškoski, Vladimir and Vrvić, Miroslav",
year = "2017",
abstract = "Cilj ovog rada je bio izolovati i upotrebiti mikrobni levan za sintezu novog tipa kalemljenog kopolimera sa stirenom i ispitati uticaj aminoaktivatora na reakciju kalemljenja., The aim of this study was to isolate and use microbial levan for the synthesis of a new type of grafted copolymer with styrene and to investigate the influence of amino activators on the grafting reaction.",
publisher = "Beograd : Udruženje mikrobioologa Srbije",
journal = "Kongres mikrobiologa Srbije, Mikromed 2017, Knjiga apstrakata,  Beograd, 11-13 maj 2017.",
title = "Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju, Microbial polysaccharide levan and polystyren in grafting reaction including amine activators",
pages = "154-155",
url = "https://hdl.handle.net/21.15107/rcub_cer_5041"
}

Kekez, B., Nikolić, V., Gojgić-Cvijović, G. D., Jakovljević, D., Beškoski, V.,& Vrvić, M.. (2017). Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju. in Kongres mikrobiologa Srbije, Mikromed 2017, Knjiga apstrakata,  Beograd, 11-13 maj 2017.
Beograd : Udruženje mikrobioologa Srbije., 154-155.
https://hdl.handle.net/21.15107/rcub_cer_5041

Kekez B, Nikolić V, Gojgić-Cvijović GD, Jakovljević D, Beškoski V, Vrvić M. Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju. in Kongres mikrobiologa Srbije, Mikromed 2017, Knjiga apstrakata,  Beograd, 11-13 maj 2017.. 2017;:154-155.
https://hdl.handle.net/21.15107/rcub_cer_5041 .

Kekez, Branka, Nikolić, Vladimir, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica, Beškoski, Vladimir, Vrvić, Miroslav, "Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju" in Kongres mikrobiologa Srbije, Mikromed 2017, Knjiga apstrakata,  Beograd, 11-13 maj 2017. (2017):154-155,
https://hdl.handle.net/21.15107/rcub_cer_5041 .

TY  - CONF
AU  - Kekez, Branka
AU  - Nikolić, Vladimir
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica
AU  - Beškoski, Vladimir
AU  - Vrvić, Miroslav
PY  - 2017
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5433
AB  - Poster presented at: Kongres mikrobiologa Srbije, Mikromed 2017, Beograd, 11-13 maj 2017.
T1  - Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju
UR  - https://hdl.handle.net/21.15107/rcub_cer_5042
ER  - 

@conference{
author = "Kekez, Branka and Nikolić, Vladimir and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica and Beškoski, Vladimir and Vrvić, Miroslav",
year = "2017",
abstract = "Poster presented at: Kongres mikrobiologa Srbije, Mikromed 2017, Beograd, 11-13 maj 2017.",
title = "Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju",
url = "https://hdl.handle.net/21.15107/rcub_cer_5042"
}

Kekez, B., Nikolić, V., Gojgić-Cvijović, G. D., Jakovljević, D., Beškoski, V.,& Vrvić, M.. (2017). Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju. .
https://hdl.handle.net/21.15107/rcub_cer_5042

Kekez B, Nikolić V, Gojgić-Cvijović GD, Jakovljević D, Beškoski V, Vrvić M. Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju. 2017;.
https://hdl.handle.net/21.15107/rcub_cer_5042 .

Kekez, Branka, Nikolić, Vladimir, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica, Beškoski, Vladimir, Vrvić, Miroslav, "Mikrobni polisaharid levan u reakciji kalemljenja stirena uz aminoaktivaciju" (2017),
https://hdl.handle.net/21.15107/rcub_cer_5042 .

TY  - DATA
AU  - Panić, Vesna V.
AU  - Seslija, Sanja I.
AU  - Popović, Ivanka G.
AU  - Spasojević, Vuk D.
AU  - Popović, Aleksandar R.
AU  - Nikolić, Vladimir
AU  - Spasojević, Pavle M.
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3059
PB  - Amer Chemical Soc, Washington
T2  - Biomacromolecules
T1  - Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3059
ER  - 

@misc{
author = "Panić, Vesna V. and Seslija, Sanja I. and Popović, Ivanka G. and Spasojević, Vuk D. and Popović, Aleksandar R. and Nikolić, Vladimir and Spasojević, Pavle M.",
year = "2017",
publisher = "Amer Chemical Soc, Washington",
journal = "Biomacromolecules",
title = "Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3059"
}

Panić, V. V., Seslija, S. I., Popović, I. G., Spasojević, V. D., Popović, A. R., Nikolić, V.,& Spasojević, P. M.. (2017). Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840. in Biomacromolecules
Amer Chemical Soc, Washington..
https://hdl.handle.net/21.15107/rcub_cherry_3059

Panić VV, Seslija SI, Popović IG, Spasojević VD, Popović AR, Nikolić V, Spasojević PM. Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840. in Biomacromolecules. 2017;.
https://hdl.handle.net/21.15107/rcub_cherry_3059 .

Panić, Vesna V., Seslija, Sanja I., Popović, Ivanka G., Spasojević, Vuk D., Popović, Aleksandar R., Nikolić, Vladimir, Spasojević, Pavle M., "Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840" in Biomacromolecules (2017),
https://hdl.handle.net/21.15107/rcub_cherry_3059 .

TY  - JOUR
AU  - Panić, Vesna V.
AU  - Seslija, Sanja I.
AU  - Popović, Ivanka G.
AU  - Spasojević, Vuk D.
AU  - Popović, Aleksandar R.
AU  - Nikolić, Vladimir
AU  - Spasojević, Pavle M.
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3058
AB  - For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.
PB  - Amer Chemical Soc, Washington
T2  - Biomacromolecules
T1  - Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid
VL  - 18
IS  - 12
SP  - 3881
EP  - 3891
DO  - 10.1021/acs.biomac.7b00840
ER  - 

@article{
author = "Panić, Vesna V. and Seslija, Sanja I. and Popović, Ivanka G. and Spasojević, Vuk D. and Popović, Aleksandar R. and Nikolić, Vladimir and Spasojević, Pavle M.",
year = "2017",
abstract = "For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.",
publisher = "Amer Chemical Soc, Washington",
journal = "Biomacromolecules",
title = "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid",
volume = "18",
number = "12",
pages = "3881-3891",
doi = "10.1021/acs.biomac.7b00840"
}

Panić, V. V., Seslija, S. I., Popović, I. G., Spasojević, V. D., Popović, A. R., Nikolić, V.,& Spasojević, P. M.. (2017). Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules
Amer Chemical Soc, Washington., 18(12), 3881-3891.
https://doi.org/10.1021/acs.biomac.7b00840

Panić VV, Seslija SI, Popović IG, Spasojević VD, Popović AR, Nikolić V, Spasojević PM. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules. 2017;18(12):3881-3891.
doi:10.1021/acs.biomac.7b00840 .

Panić, Vesna V., Seslija, Sanja I., Popović, Ivanka G., Spasojević, Vuk D., Popović, Aleksandar R., Nikolić, Vladimir, Spasojević, Pavle M., "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid" in Biomacromolecules, 18, no. 12 (2017):3881-3891,
https://doi.org/10.1021/acs.biomac.7b00840 . .

TY  - JOUR
AU  - Panić, Vesna V.
AU  - Seslija, Sanja I.
AU  - Popović, Ivanka G.
AU  - Spasojević, Vuk D.
AU  - Popović, Aleksandar R.
AU  - Nikolić, Vladimir
AU  - Spasojević, Pavle M.
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2568
AB  - For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.
PB  - Amer Chemical Soc, Washington
T2  - Biomacromolecules
T1  - Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid
VL  - 18
IS  - 12
SP  - 3881
EP  - 3891
DO  - 10.1021/acs.biomac.7b00840
ER  - 

@article{
author = "Panić, Vesna V. and Seslija, Sanja I. and Popović, Ivanka G. and Spasojević, Vuk D. and Popović, Aleksandar R. and Nikolić, Vladimir and Spasojević, Pavle M.",
year = "2017",
abstract = "For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.",
publisher = "Amer Chemical Soc, Washington",
journal = "Biomacromolecules",
title = "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid",
volume = "18",
number = "12",
pages = "3881-3891",
doi = "10.1021/acs.biomac.7b00840"
}

Panić, V. V., Seslija, S. I., Popović, I. G., Spasojević, V. D., Popović, A. R., Nikolić, V.,& Spasojević, P. M.. (2017). Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules
Amer Chemical Soc, Washington., 18(12), 3881-3891.
https://doi.org/10.1021/acs.biomac.7b00840

Panić VV, Seslija SI, Popović IG, Spasojević VD, Popović AR, Nikolić V, Spasojević PM. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules. 2017;18(12):3881-3891.
doi:10.1021/acs.biomac.7b00840 .

Panić, Vesna V., Seslija, Sanja I., Popović, Ivanka G., Spasojević, Vuk D., Popović, Aleksandar R., Nikolić, Vladimir, Spasojević, Pavle M., "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid" in Biomacromolecules, 18, no. 12 (2017):3881-3891,
https://doi.org/10.1021/acs.biomac.7b00840 . .

TY  - CONF
AU  - Šaponjić, Aleksandra
AU  - Kokunešoski, Maja
AU  - Perović, Ivana
AU  - Vuković, Marina
AU  - Šaponjić, Đorđe
AU  - Nikolić, Vladimir
AU  - Marčeta Kaninski, Milica
PY  - 2017
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5288
AB  - Co/Mo carbides were prepared by co-impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS) . Electrochemical characterization of obtained materials was performed by cyclic voltammetry in acide solution. Bimetallic CoMo carbide obtained by using carbothermal hydrogen reduction of Co Mo precursors is formed when the Co/Mo molar ratio is 1.0.
PB  - University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia
C3  - 6th International Symposium Mining and Enviromental Protection Proceedings
T1  - Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization
SP  - 375
EP  - 380
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5288
ER  - 

@conference{
author = "Šaponjić, Aleksandra and Kokunešoski, Maja and Perović, Ivana and Vuković, Marina and Šaponjić, Đorđe and Nikolić, Vladimir and Marčeta Kaninski, Milica",
year = "2017",
abstract = "Co/Mo carbides were prepared by co-impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS) . Electrochemical characterization of obtained materials was performed by cyclic voltammetry in acide solution. Bimetallic CoMo carbide obtained by using carbothermal hydrogen reduction of Co Mo precursors is formed when the Co/Mo molar ratio is 1.0.",
publisher = "University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia",
journal = "6th International Symposium Mining and Enviromental Protection Proceedings",
title = "Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization",
pages = "375-380",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5288"
}

Šaponjić, A., Kokunešoski, M., Perović, I., Vuković, M., Šaponjić, Đ., Nikolić, V.,& Marčeta Kaninski, M.. (2017). Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization. in 6th International Symposium Mining and Enviromental Protection Proceedings
University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia., 375-380.
https://hdl.handle.net/21.15107/rcub_cherry_5288

Šaponjić A, Kokunešoski M, Perović I, Vuković M, Šaponjić Đ, Nikolić V, Marčeta Kaninski M. Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization. in 6th International Symposium Mining and Enviromental Protection Proceedings. 2017;:375-380.
https://hdl.handle.net/21.15107/rcub_cherry_5288 .

Šaponjić, Aleksandra, Kokunešoski, Maja, Perović, Ivana, Vuković, Marina, Šaponjić, Đorđe, Nikolić, Vladimir, Marčeta Kaninski, Milica, "Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization" in 6th International Symposium Mining and Enviromental Protection Proceedings (2017):375-380,
https://hdl.handle.net/21.15107/rcub_cherry_5288 .

TY  - CONF
AU  - Nikolić, Vladimir
AU  - Kekez, Branka
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica
AU  - Beškoski, Vladimir
AU  - Popović, Aleksandar R.
PY  - 2016
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5251
AB  - The aim of this work is the isolation of levan from the Bacillus licheniformis strain and the synthesis of a new levan-polystyrene grafted copolymer.
AB  - Cilj ovog rada je izolovanje levana iz soja Bacillus licheniformis i sinteza novog levan-polistiren graftovanog kopomlimera.
PB  - Belgrade : Serbian Chemical Society
C3  - 53. Savetovanje Srpskog hemijskog društva - Program i kratki izvodi radova, Kragujevac, 10. i 11. jun 2016
T1  - Sinteza graftovanog kopolimera upotrebom mikrobnog levana i polistirena
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5251
ER  - 

@conference{
author = "Nikolić, Vladimir and Kekez, Branka and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica and Beškoski, Vladimir and Popović, Aleksandar R.",
year = "2016",
abstract = "The aim of this work is the isolation of levan from the Bacillus licheniformis strain and the synthesis of a new levan-polystyrene grafted copolymer., Cilj ovog rada je izolovanje levana iz soja Bacillus licheniformis i sinteza novog levan-polistiren graftovanog kopomlimera.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "53. Savetovanje Srpskog hemijskog društva - Program i kratki izvodi radova, Kragujevac, 10. i 11. jun 2016",
title = "Sinteza graftovanog kopolimera upotrebom mikrobnog levana i polistirena",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5251"
}

Nikolić, V., Kekez, B., Gojgić-Cvijović, G. D., Jakovljević, D., Beškoski, V.,& Popović, A. R.. (2016). Sinteza graftovanog kopolimera upotrebom mikrobnog levana i polistirena. in 53. Savetovanje Srpskog hemijskog društva - Program i kratki izvodi radova, Kragujevac, 10. i 11. jun 2016
Belgrade : Serbian Chemical Society., 87.
https://hdl.handle.net/21.15107/rcub_cherry_5251

Nikolić V, Kekez B, Gojgić-Cvijović GD, Jakovljević D, Beškoski V, Popović AR. Sinteza graftovanog kopolimera upotrebom mikrobnog levana i polistirena. in 53. Savetovanje Srpskog hemijskog društva - Program i kratki izvodi radova, Kragujevac, 10. i 11. jun 2016. 2016;:87.
https://hdl.handle.net/21.15107/rcub_cherry_5251 .

Nikolić, Vladimir, Kekez, Branka, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica, Beškoski, Vladimir, Popović, Aleksandar R., "Sinteza graftovanog kopolimera upotrebom mikrobnog levana i polistirena" in 53. Savetovanje Srpskog hemijskog društva - Program i kratki izvodi radova, Kragujevac, 10. i 11. jun 2016 (2016):87,
https://hdl.handle.net/21.15107/rcub_cherry_5251 .

TY  - JOUR
AU  - Kekez, Branka
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica M.
AU  - Pavlović, Vladimir D.
AU  - Beškoski, Vladimir
AU  - Popović, Aleksandar R.
AU  - Vrvić, Miroslav M.
AU  - Nikolić, Vladimir
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2300
AB  - Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could potentially have many applications, such as compatibilizers and material for membranes. (C) 2016 Elsevier Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Synthesis and characterization of a new type of levan-graft-polystyrene copolymer
VL  - 154
SP  - 20
EP  - 29
DO  - 10.1016/j.carbpol.2016.08.001
ER  - 

@article{
author = "Kekez, Branka and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica M. and Pavlović, Vladimir D. and Beškoski, Vladimir and Popović, Aleksandar R. and Vrvić, Miroslav M. and Nikolić, Vladimir",
year = "2016",
abstract = "Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could potentially have many applications, such as compatibilizers and material for membranes. (C) 2016 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Synthesis and characterization of a new type of levan-graft-polystyrene copolymer",
volume = "154",
pages = "20-29",
doi = "10.1016/j.carbpol.2016.08.001"
}

Kekez, B., Gojgić-Cvijović, G. D., Jakovljević, D. M., Pavlović, V. D., Beškoski, V., Popović, A. R., Vrvić, M. M.,& Nikolić, V.. (2016). Synthesis and characterization of a new type of levan-graft-polystyrene copolymer. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 154, 20-29.
https://doi.org/10.1016/j.carbpol.2016.08.001

Kekez B, Gojgić-Cvijović GD, Jakovljević DM, Pavlović VD, Beškoski V, Popović AR, Vrvić MM, Nikolić V. Synthesis and characterization of a new type of levan-graft-polystyrene copolymer. in Carbohydrate Polymers. 2016;154:20-29.
doi:10.1016/j.carbpol.2016.08.001 .

Kekez, Branka, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica M., Pavlović, Vladimir D., Beškoski, Vladimir, Popović, Aleksandar R., Vrvić, Miroslav M., Nikolić, Vladimir, "Synthesis and characterization of a new type of levan-graft-polystyrene copolymer" in Carbohydrate Polymers, 154 (2016):20-29,
https://doi.org/10.1016/j.carbpol.2016.08.001 . .

TY  - DATA
AU  - Kekez, Branka
AU  - Gojgić-Cvijović, Gordana D.
AU  - Jakovljević, Dragica M.
AU  - Pavlović, Vladimir D.
AU  - Beškoski, Vladimir
AU  - Popović, Aleksandar R.
AU  - Vrvić, Miroslav M.
AU  - Nikolić, Vladimir
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3624
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Supplementary data for the article: Kekez, B.; Gojgić-Cvijović, G.; Jakovljević, D.; Pavlović, V.; Beškoski, V.; Popović, A.; Vrvić, M. M.; Nikolić, V. Synthesis and Characterization of a New Type of Levan-Graft-Polystyrene Copolymer. Carbohydrate Polymers 2016, 154, 20–29. https://doi.org/10.1016/j.carbpol.2016.08.001
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3624
ER  - 

@misc{
author = "Kekez, Branka and Gojgić-Cvijović, Gordana D. and Jakovljević, Dragica M. and Pavlović, Vladimir D. and Beškoski, Vladimir and Popović, Aleksandar R. and Vrvić, Miroslav M. and Nikolić, Vladimir",
year = "2016",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Supplementary data for the article: Kekez, B.; Gojgić-Cvijović, G.; Jakovljević, D.; Pavlović, V.; Beškoski, V.; Popović, A.; Vrvić, M. M.; Nikolić, V. Synthesis and Characterization of a New Type of Levan-Graft-Polystyrene Copolymer. Carbohydrate Polymers 2016, 154, 20–29. https://doi.org/10.1016/j.carbpol.2016.08.001",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3624"
}

Kekez, B., Gojgić-Cvijović, G. D., Jakovljević, D. M., Pavlović, V. D., Beškoski, V., Popović, A. R., Vrvić, M. M.,& Nikolić, V.. (2016). Supplementary data for the article: Kekez, B.; Gojgić-Cvijović, G.; Jakovljević, D.; Pavlović, V.; Beškoski, V.; Popović, A.; Vrvić, M. M.; Nikolić, V. Synthesis and Characterization of a New Type of Levan-Graft-Polystyrene Copolymer. Carbohydrate Polymers 2016, 154, 20–29. https://doi.org/10.1016/j.carbpol.2016.08.001. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford..
https://hdl.handle.net/21.15107/rcub_cherry_3624

Kekez B, Gojgić-Cvijović GD, Jakovljević DM, Pavlović VD, Beškoski V, Popović AR, Vrvić MM, Nikolić V. Supplementary data for the article: Kekez, B.; Gojgić-Cvijović, G.; Jakovljević, D.; Pavlović, V.; Beškoski, V.; Popović, A.; Vrvić, M. M.; Nikolić, V. Synthesis and Characterization of a New Type of Levan-Graft-Polystyrene Copolymer. Carbohydrate Polymers 2016, 154, 20–29. https://doi.org/10.1016/j.carbpol.2016.08.001. in Carbohydrate Polymers. 2016;.
https://hdl.handle.net/21.15107/rcub_cherry_3624 .

Kekez, Branka, Gojgić-Cvijović, Gordana D., Jakovljević, Dragica M., Pavlović, Vladimir D., Beškoski, Vladimir, Popović, Aleksandar R., Vrvić, Miroslav M., Nikolić, Vladimir, "Supplementary data for the article: Kekez, B.; Gojgić-Cvijović, G.; Jakovljević, D.; Pavlović, V.; Beškoski, V.; Popović, A.; Vrvić, M. M.; Nikolić, V. Synthesis and Characterization of a New Type of Levan-Graft-Polystyrene Copolymer. Carbohydrate Polymers 2016, 154, 20–29. https://doi.org/10.1016/j.carbpol.2016.08.001" in Carbohydrate Polymers (2016),
https://hdl.handle.net/21.15107/rcub_cherry_3624 .

TY  - JOUR
AU  - Sokić, M.
AU  - Kamberović, Željko
AU  - Nikolić, Vladimir
AU  - Marković, Bojan D.
AU  - Korać, Marija
AU  - Anić, Z.
AU  - Gavrilovski, Milorad
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/287
AB  - The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2 reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3 catalysts. The effect of temperature and time on NiO and NiCl2 reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and used to determine activation energy of the NiO and NiCl2 reduction for the investigated temperature range (623-923 K) and time intervals (1-5 minutes). The investigation enabled reaching conclusions about the reaction ability and rate of the reduction processes. Afterward, Ni/Al2O3 catalysts were obtained by using oxide and chloride precursor for Ni. The catalysts were supported on alumina-based foam and prepared via aerosol route. Properties of the samples before and after low-temperature hydrogen reduction (633 K) were compared. Obtained results indicated that the synthesis of Ni/Al2O3 catalysts can be more efficient if chloride precursor for Ni is directly reduced by hydrogen during the synthesis process, without the calcination step. In addition, Ni-Pd/Al2O3 catalysts with different metal content were prepared by using chloride precursors. Lower reduction temperature was utilized and the chlorides were almost completely reduced at 533 K. © 2015 Miroslav Sokić et al.
T2  - Scientific World Journal
T1  - Kinetics of NiO and NiCl2 hydrogen reduction as precursors and properties of produced Ni/Al2O3 and Ni-Pd/Al2O3 catalysts
VL  - 2015
SP  - 601970
DO  - 10.1155/2015/601970
ER  - 

@article{
author = "Sokić, M. and Kamberović, Željko and Nikolić, Vladimir and Marković, Bojan D. and Korać, Marija and Anić, Z. and Gavrilovski, Milorad",
year = "2015",
abstract = "The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2 reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3 catalysts. The effect of temperature and time on NiO and NiCl2 reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and used to determine activation energy of the NiO and NiCl2 reduction for the investigated temperature range (623-923 K) and time intervals (1-5 minutes). The investigation enabled reaching conclusions about the reaction ability and rate of the reduction processes. Afterward, Ni/Al2O3 catalysts were obtained by using oxide and chloride precursor for Ni. The catalysts were supported on alumina-based foam and prepared via aerosol route. Properties of the samples before and after low-temperature hydrogen reduction (633 K) were compared. Obtained results indicated that the synthesis of Ni/Al2O3 catalysts can be more efficient if chloride precursor for Ni is directly reduced by hydrogen during the synthesis process, without the calcination step. In addition, Ni-Pd/Al2O3 catalysts with different metal content were prepared by using chloride precursors. Lower reduction temperature was utilized and the chlorides were almost completely reduced at 533 K. © 2015 Miroslav Sokić et al.",
journal = "Scientific World Journal",
title = "Kinetics of NiO and NiCl2 hydrogen reduction as precursors and properties of produced Ni/Al2O3 and Ni-Pd/Al2O3 catalysts",
volume = "2015",
pages = "601970",
doi = "10.1155/2015/601970"
}

Sokić, M., Kamberović, Ž., Nikolić, V., Marković, B. D., Korać, M., Anić, Z.,& Gavrilovski, M.. (2015). Kinetics of NiO and NiCl2 hydrogen reduction as precursors and properties of produced Ni/Al2O3 and Ni-Pd/Al2O3 catalysts. in Scientific World Journal, 2015, 601970.
https://doi.org/10.1155/2015/601970

Sokić M, Kamberović Ž, Nikolić V, Marković BD, Korać M, Anić Z, Gavrilovski M. Kinetics of NiO and NiCl2 hydrogen reduction as precursors and properties of produced Ni/Al2O3 and Ni-Pd/Al2O3 catalysts. in Scientific World Journal. 2015;2015:601970.
doi:10.1155/2015/601970 .

Sokić, M., Kamberović, Željko, Nikolić, Vladimir, Marković, Bojan D., Korać, Marija, Anić, Z., Gavrilovski, Milorad, "Kinetics of NiO and NiCl2 hydrogen reduction as precursors and properties of produced Ni/Al2O3 and Ni-Pd/Al2O3 catalysts" in Scientific World Journal, 2015 (2015):601970,
https://doi.org/10.1155/2015/601970 . .

TY  - JOUR
AU  - Spasojevic, Pavle
AU  - Panic, Vesna
AU  - Seslija, Sanja
AU  - Nikolić, Vladimir
AU  - Popović, Ivanka G.
AU  - Veličković, Sava
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1992
AB  - The aim of this work was to examine the possibility of modification of commercial denture base materials with itaconic acid esters, in order to obtain materials with lower toxicity and higher biocompatibility. Despite their relatively higher price compared to methacrylates, itaconic acid and itaconates are materials of choice for environmentally friendly applications, because they are not produced from petrochemical sources, but from plant products. A commercial system based on poly(methyl methacrylate) was modified using ditetrahydrofurfuryl itaconate (DTHFI), whereby the ratio of DTHFI was varied from 2.5 to 10 % by weight. Copolymerization was confirmed using FTIR spectroscopy, while SEM analysis showed the absence of micro defects and pores in the structure. The effects of the itaconate content on the absorption of fluids, the residual monomer content, thermal, dynamic-mechanical and mechanical properties (hardness, toughness, stress and elongation at break) were investigated. It was found that the addition of DTHFI significantly reduced the amount of residual methyl methacrylate, which made these materials less toxic. It was shown that increasing the DTHFI content resulted in materials with decreased glass transition temperatures, as well as with decreased storage modulus, ultimate tensile strength and impact fracture resistance; however the mechanical properties were in the rang prescribed by ADA standards, and the materials could be used in practice. The deterioration in mechanical properties was therefore worthwhile in order to gain lower toxicity of the leached monomer.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties
VL  - 80
IS  - 9
SP  - 1177
DO  - 10.2298/JSC150123034S
ER  - 

@article{
author = "Spasojevic, Pavle and Panic, Vesna and Seslija, Sanja and Nikolić, Vladimir and Popović, Ivanka G. and Veličković, Sava",
year = "2015",
abstract = "The aim of this work was to examine the possibility of modification of commercial denture base materials with itaconic acid esters, in order to obtain materials with lower toxicity and higher biocompatibility. Despite their relatively higher price compared to methacrylates, itaconic acid and itaconates are materials of choice for environmentally friendly applications, because they are not produced from petrochemical sources, but from plant products. A commercial system based on poly(methyl methacrylate) was modified using ditetrahydrofurfuryl itaconate (DTHFI), whereby the ratio of DTHFI was varied from 2.5 to 10 % by weight. Copolymerization was confirmed using FTIR spectroscopy, while SEM analysis showed the absence of micro defects and pores in the structure. The effects of the itaconate content on the absorption of fluids, the residual monomer content, thermal, dynamic-mechanical and mechanical properties (hardness, toughness, stress and elongation at break) were investigated. It was found that the addition of DTHFI significantly reduced the amount of residual methyl methacrylate, which made these materials less toxic. It was shown that increasing the DTHFI content resulted in materials with decreased glass transition temperatures, as well as with decreased storage modulus, ultimate tensile strength and impact fracture resistance; however the mechanical properties were in the rang prescribed by ADA standards, and the materials could be used in practice. The deterioration in mechanical properties was therefore worthwhile in order to gain lower toxicity of the leached monomer.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties",
volume = "80",
number = "9",
pages = "1177",
doi = "10.2298/JSC150123034S"
}

Spasojevic, P., Panic, V., Seslija, S., Nikolić, V., Popović, I. G.,& Veličković, S.. (2015). Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 80(9), 1177.
https://doi.org/10.2298/JSC150123034S

Spasojevic P, Panic V, Seslija S, Nikolić V, Popović IG, Veličković S. Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties. in Journal of the Serbian Chemical Society. 2015;80(9):1177.
doi:10.2298/JSC150123034S .

Spasojevic, Pavle, Panic, Vesna, Seslija, Sanja, Nikolić, Vladimir, Popović, Ivanka G., Veličković, Sava, "Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties" in Journal of the Serbian Chemical Society, 80, no. 9 (2015):1177,
https://doi.org/10.2298/JSC150123034S . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1495
AB  - Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).
PB  - Springer, Dordrecht
T2  - Journal of Polymer Research
T1  - Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch
VL  - 21
IS  - 2
DO  - 10.1007/s10965-014-0363-1
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2014",
abstract = "Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).",
publisher = "Springer, Dordrecht",
journal = "Journal of Polymer Research",
title = "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch",
volume = "21",
number = "2",
doi = "10.1007/s10965-014-0363-1"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2014). Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research
Springer, Dordrecht., 21(2).
https://doi.org/10.1007/s10965-014-0363-1

Nikolić V, Veličković S, Popović AR. Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research. 2014;21(2).
doi:10.1007/s10965-014-0363-1 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch" in Journal of Polymer Research, 21, no. 2 (2014),
https://doi.org/10.1007/s10965-014-0363-1 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1831
AB  - Materials based on polystyrene and starch copolymers are used in food packaging, water pollution treatment, and textile industry, and their biodegradability is a desired characteristic. In order to examine the degradation patterns of modified, biodegradable derivates of polystyrene, which may keep its excellent technical features but be more environmentally friendly at the same time, polystyrene-graft-starch biomaterials obtained by emulsion polymerization in the presence of new type of initiator/activator pair (potassium persulfate/different amines) were subjected to 6-month biodegradation by burial method in three different types of commercially available soils: soil rich in humus and soil for cactus and orchid growing. Biodegradation was monitored by mass decrease, and the highest degradation rate was achieved in soil for cactus growing (81.30 %). Statistical analysis proved that microorganisms in different soil samples have different ability of biodegradation, and there is a significant negative correlation between the share of polystyrene in copolymer and degree of biodegradation. Grafting of polystyrene on starch on one hand prevents complete degradation of starch that is present (with maximal percentage of degraded starch ranging from 55 to 93 %), while on the other hand there is an upper limit of share of polystyrene in the copolymer (ranging from 37 to 77 %) that is preventing biodegradation of degradable part of copolymers.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Science and Pollution Research
T1  - Biodegradation of polystyrene-graft-starch copolymers in three different types of soil
VL  - 21
IS  - 16
SP  - 9877
EP  - 9886
DO  - 10.1007/s11356-014-2946-0
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2014",
abstract = "Materials based on polystyrene and starch copolymers are used in food packaging, water pollution treatment, and textile industry, and their biodegradability is a desired characteristic. In order to examine the degradation patterns of modified, biodegradable derivates of polystyrene, which may keep its excellent technical features but be more environmentally friendly at the same time, polystyrene-graft-starch biomaterials obtained by emulsion polymerization in the presence of new type of initiator/activator pair (potassium persulfate/different amines) were subjected to 6-month biodegradation by burial method in three different types of commercially available soils: soil rich in humus and soil for cactus and orchid growing. Biodegradation was monitored by mass decrease, and the highest degradation rate was achieved in soil for cactus growing (81.30 %). Statistical analysis proved that microorganisms in different soil samples have different ability of biodegradation, and there is a significant negative correlation between the share of polystyrene in copolymer and degree of biodegradation. Grafting of polystyrene on starch on one hand prevents complete degradation of starch that is present (with maximal percentage of degraded starch ranging from 55 to 93 %), while on the other hand there is an upper limit of share of polystyrene in the copolymer (ranging from 37 to 77 %) that is preventing biodegradation of degradable part of copolymers.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Science and Pollution Research",
title = "Biodegradation of polystyrene-graft-starch copolymers in three different types of soil",
volume = "21",
number = "16",
pages = "9877-9886",
doi = "10.1007/s11356-014-2946-0"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2014). Biodegradation of polystyrene-graft-starch copolymers in three different types of soil. in Environmental Science and Pollution Research
Springer Heidelberg, Heidelberg., 21(16), 9877-9886.
https://doi.org/10.1007/s11356-014-2946-0

Nikolić V, Veličković S, Popović AR. Biodegradation of polystyrene-graft-starch copolymers in three different types of soil. in Environmental Science and Pollution Research. 2014;21(16):9877-9886.
doi:10.1007/s11356-014-2946-0 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Biodegradation of polystyrene-graft-starch copolymers in three different types of soil" in Environmental Science and Pollution Research, 21, no. 16 (2014):9877-9886,
https://doi.org/10.1007/s11356-014-2946-0 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Antonović, Dušan G.
AU  - Popović, Aleksandar R.
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1425
AB  - In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established.
AB  - U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water
T1  - Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi
VL  - 78
IS  - 9
SP  - 1425
EP  - 1441
DO  - 10.2298/JSC121216051N
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Antonović, Dušan G. and Popović, Aleksandar R.",
year = "2013",
abstract = "In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established., U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water, Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi",
volume = "78",
number = "9",
pages = "1425-1441",
doi = "10.2298/JSC121216051N"
}

Nikolić, V., Veličković, S., Antonović, D. G.,& Popović, A. R.. (2013). Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 78(9), 1425-1441.
https://doi.org/10.2298/JSC121216051N

Nikolić V, Veličković S, Antonović DG, Popović AR. Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society. 2013;78(9):1425-1441.
doi:10.2298/JSC121216051N .

Nikolić, Vladimir, Veličković, Sava, Antonović, Dušan G., Popović, Aleksandar R., "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water" in Journal of the Serbian Chemical Society, 78, no. 9 (2013):1425-1441,
https://doi.org/10.2298/JSC121216051N . .

TY  - THES
AU  - Nikolić, Vladimir
PY  - 2013
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=906
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:7424/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=44745743
UR  - http://nardus.mpn.gov.rs/123456789/3478
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2624
AB  - U prvom delu ove doktorske disertacije sintetisani su kalemljeni kopolimeri polistirena i skroba emulzionom polimerizacijom u vodi uz korišćenje natrijum-laurilsulfata kao emulgatora. Ispitivan je uticaj različitih amina kao aktivatora polimerizacije na stepen kalemljenja polistirena na skrob, a ispitivanje ovog uticaj do sada nije zabeleţeno u literaturi. Promenom reakcione temperature, koncentracije monomera i inicijatora, pH vrednosti, vremena i količine aktivatora teţilo se dobijanju maksimalnih vrednosti stepena kalemljenja, a maksimalna dobijena vrednost iznosila je 32,55 %, što je za oko 8,5 % veće od najviše literaturne vrednosti.U drugom delu ovog rada sintetisani su kalemljeni kopolimeri poli(metakrilne kiseline) i skroba u vodi kao rastvaraču uz korišćenje različitih amina kao aktivatora polimerizacije (ovaj uticaj do sada nije ispitan u literaturi), sa ciljem dobijanja što većeg stepena kalemljenja. Da bi se dobile maksimalne vrednosti za stepen kalemljenja, praćen je uticaj promene reakcione temperature, reakcionog vremena, koncentracije monomera, količine inicijatora, količine aktivatora i pH vrednosti. Dobijene vrednosti za stepen kalemljenja kod kalemljenih kopolimera skroba i poli(metakrilne kiseline) su najveće do sada publikovane u literaturi. Maksimalna vrednost stepena kalemljenja iznosila je 40,92 %, što je za oko 10 % veće od najviše literaturne vrednosti.Dobijeni kopolimeri ispitivani su infracrvenom spektroskopijom sa Furijevom transformacijom i skenirajućom elektronskom mikroskopijom.U trećem delu doktorske teze praćeni su procesi degradacije dobijenih kopolimera u ţivotnoj sredini. Degradacija kopolimera u zemljištu, tj. u tri različita tipa zemljišta, trajala je 6 meseci, a za ovu namenu korišćeni su sledeći tipovi zemljišta: zemljište bogato humusom, zemljište za uzgajanje kaktusa i zemljište za uzgajanjeorhideja. TakoĎe, ispitivana je degradcija kalemljenih kopolimera u veštačkoj otpadnoj vodi, dobijenoj iz reke Save. Prilikom degradacije u vodi korišćen je kontinualni protočni sistem. Gubitak mase kopolimera tokom procesa degradacije korišćen je kod obe metode za odreĎivanje vrednosti stepena degradacije. Degradacija kalemljenih kopolimera skroba i poli(metakrilne kiseline) u zemljištu i degradacija obe vrste kopolimera u veštačkoj otpadnoj vodi do sada nije zabeleţena u literaturi.Ispitivanjem je utvrĎeno da je degradacija svih uzoraka kopolimera znatno brţa u veštačkoj otpadnoj vodi, gde ceo proces degradacije traje manje od mesec dana, nego u zemljištu. Rezultati degradacije u zemljištu pokazuju da je degradacija najbrţa u zemljištu za uzgajanje kaktusa (kod kalemljenih kopolimera polistirena i skroba), a kod kalemljenih kopolimera skroba i poli(metakrilne kiseline) u zemljištu za uzgajanje orhideja. Statističkom obradom podataka, utvrĎeno je postojanje značajne korelacije izmeĎu stepena degradacije i stepena kalemljenja kod kalemljenih kopolimera skroba i polistirena, kao i udeo skroba u kopolimerima koji je neophodan da bi došlo do biodegradacije, kao i udeo polistirena u kopolimerima koji bi doveo do sprečavanja biodegradacije.
AB  - In the first part of this doctoral dissertation graft copolymers of polystyrene and starch were synthesized by emulsion polymerization in water with sodium dodecyl sulfate as an emulsifier. Influence of different amines, as activators of polymerization, on the percentage of grafting of polystyrene on starch was investigated and investigation of this influence has not been noted in the literature. Changes in reaction temperature, concentration of the monomer and initiator, pH value, time and amount of activator strive to obtain maximum value of percentage of grafting and maximal obtained value was 32.55 % which was about 8.5 % higher than maximal literature value.In the second part of this study, graft copolymers of poly(methacrylic acid) and starch were synthesized in aqueous media using different amines as activator of polymerization (there is no literature data about this influence) with the aim to obtaining a higher percentage of grafting. Influence of temperature, reaction time, monomer concentration, amount of initiator, amount of activator and pH value were monitored to obtain maximum values for percentage of grafting. Obtained values for percentage of grafting of starch and poly(methacrylic acid) grafted copolymers were the highest ever obtained in literature. The maximum value for percentage of grafting was 40.92 % which was about 10 % higher than maximal literatue value.The obtained copolymers were characterized by Fourier transformed infrared spectroscopy and by scanning electron microscopy.At the third part of this doctoral dissertation, the degradation processes of copolymers were monitored in environment. Degradation of copolymers in soil, i.e. inthree different type of soil, lasted for six months and for this study the following soil types were used: soil rich in humus, soil for cactus growing and soil for orchid growing. Also, degradation of graft copolymers in artificial wastewater obtaines from River Sava was monitored. During degradation in water, the continuous flow system was used. Mass loss of copolymers during degradation was used in both methods for obtaining values for measuring the degree of degradation. Degradation of poly(methacrylic acid) and starch grafted copolymers in soils and degradation of both types of copolymers in the artificial waste water have not been noted in the literature.Investigation has shown that the degradation of all samples of copolymers in artificial waste water was much faster, where all degradation processes lasted less than a month, than in soil. The results of degradation in soil show that degradation was fastest in soil for cactus growing (for grafted copolymers of polystyrene and starch) and for grafted copolymers of poly(methacrylic acid) and starch in soil for orchid growing. Statistical analysis of data show excellent correlation between degree of degradation and percentage of grafting for graft copolymers of polystyrene and starch and share of starch in copolymers which is necessary to biodegradation started and share of polystyrene in copolymers that prevented biodegradation.
PB  - Универзитет у Београду, Хемијски факултет
T2  - Универзитет у Београду
T1  - Kopolimeri dobijeni kalemljenjem vinilnih monomera na skrob - uticaj amina na sintezu i procesi degradacije u životnoj sredini
T1  - Copolumers obtained by grafting of vinyl monomers on starch - influence of amines on synthesis and degradation processes in environment
UR  - https://hdl.handle.net/21.15107/rcub_nardus_3478
ER  - 

@phdthesis{
author = "Nikolić, Vladimir",
year = "2013",
abstract = "U prvom delu ove doktorske disertacije sintetisani su kalemljeni kopolimeri polistirena i skroba emulzionom polimerizacijom u vodi uz korišćenje natrijum-laurilsulfata kao emulgatora. Ispitivan je uticaj različitih amina kao aktivatora polimerizacije na stepen kalemljenja polistirena na skrob, a ispitivanje ovog uticaj do sada nije zabeleţeno u literaturi. Promenom reakcione temperature, koncentracije monomera i inicijatora, pH vrednosti, vremena i količine aktivatora teţilo se dobijanju maksimalnih vrednosti stepena kalemljenja, a maksimalna dobijena vrednost iznosila je 32,55 %, što je za oko 8,5 % veće od najviše literaturne vrednosti.U drugom delu ovog rada sintetisani su kalemljeni kopolimeri poli(metakrilne kiseline) i skroba u vodi kao rastvaraču uz korišćenje različitih amina kao aktivatora polimerizacije (ovaj uticaj do sada nije ispitan u literaturi), sa ciljem dobijanja što većeg stepena kalemljenja. Da bi se dobile maksimalne vrednosti za stepen kalemljenja, praćen je uticaj promene reakcione temperature, reakcionog vremena, koncentracije monomera, količine inicijatora, količine aktivatora i pH vrednosti. Dobijene vrednosti za stepen kalemljenja kod kalemljenih kopolimera skroba i poli(metakrilne kiseline) su najveće do sada publikovane u literaturi. Maksimalna vrednost stepena kalemljenja iznosila je 40,92 %, što je za oko 10 % veće od najviše literaturne vrednosti.Dobijeni kopolimeri ispitivani su infracrvenom spektroskopijom sa Furijevom transformacijom i skenirajućom elektronskom mikroskopijom.U trećem delu doktorske teze praćeni su procesi degradacije dobijenih kopolimera u ţivotnoj sredini. Degradacija kopolimera u zemljištu, tj. u tri različita tipa zemljišta, trajala je 6 meseci, a za ovu namenu korišćeni su sledeći tipovi zemljišta: zemljište bogato humusom, zemljište za uzgajanje kaktusa i zemljište za uzgajanjeorhideja. TakoĎe, ispitivana je degradcija kalemljenih kopolimera u veštačkoj otpadnoj vodi, dobijenoj iz reke Save. Prilikom degradacije u vodi korišćen je kontinualni protočni sistem. Gubitak mase kopolimera tokom procesa degradacije korišćen je kod obe metode za odreĎivanje vrednosti stepena degradacije. Degradacija kalemljenih kopolimera skroba i poli(metakrilne kiseline) u zemljištu i degradacija obe vrste kopolimera u veštačkoj otpadnoj vodi do sada nije zabeleţena u literaturi.Ispitivanjem je utvrĎeno da je degradacija svih uzoraka kopolimera znatno brţa u veštačkoj otpadnoj vodi, gde ceo proces degradacije traje manje od mesec dana, nego u zemljištu. Rezultati degradacije u zemljištu pokazuju da je degradacija najbrţa u zemljištu za uzgajanje kaktusa (kod kalemljenih kopolimera polistirena i skroba), a kod kalemljenih kopolimera skroba i poli(metakrilne kiseline) u zemljištu za uzgajanje orhideja. Statističkom obradom podataka, utvrĎeno je postojanje značajne korelacije izmeĎu stepena degradacije i stepena kalemljenja kod kalemljenih kopolimera skroba i polistirena, kao i udeo skroba u kopolimerima koji je neophodan da bi došlo do biodegradacije, kao i udeo polistirena u kopolimerima koji bi doveo do sprečavanja biodegradacije., In the first part of this doctoral dissertation graft copolymers of polystyrene and starch were synthesized by emulsion polymerization in water with sodium dodecyl sulfate as an emulsifier. Influence of different amines, as activators of polymerization, on the percentage of grafting of polystyrene on starch was investigated and investigation of this influence has not been noted in the literature. Changes in reaction temperature, concentration of the monomer and initiator, pH value, time and amount of activator strive to obtain maximum value of percentage of grafting and maximal obtained value was 32.55 % which was about 8.5 % higher than maximal literature value.In the second part of this study, graft copolymers of poly(methacrylic acid) and starch were synthesized in aqueous media using different amines as activator of polymerization (there is no literature data about this influence) with the aim to obtaining a higher percentage of grafting. Influence of temperature, reaction time, monomer concentration, amount of initiator, amount of activator and pH value were monitored to obtain maximum values for percentage of grafting. Obtained values for percentage of grafting of starch and poly(methacrylic acid) grafted copolymers were the highest ever obtained in literature. The maximum value for percentage of grafting was 40.92 % which was about 10 % higher than maximal literatue value.The obtained copolymers were characterized by Fourier transformed infrared spectroscopy and by scanning electron microscopy.At the third part of this doctoral dissertation, the degradation processes of copolymers were monitored in environment. Degradation of copolymers in soil, i.e. inthree different type of soil, lasted for six months and for this study the following soil types were used: soil rich in humus, soil for cactus growing and soil for orchid growing. Also, degradation of graft copolymers in artificial wastewater obtaines from River Sava was monitored. During degradation in water, the continuous flow system was used. Mass loss of copolymers during degradation was used in both methods for obtaining values for measuring the degree of degradation. Degradation of poly(methacrylic acid) and starch grafted copolymers in soils and degradation of both types of copolymers in the artificial waste water have not been noted in the literature.Investigation has shown that the degradation of all samples of copolymers in artificial waste water was much faster, where all degradation processes lasted less than a month, than in soil. The results of degradation in soil show that degradation was fastest in soil for cactus growing (for grafted copolymers of polystyrene and starch) and for grafted copolymers of poly(methacrylic acid) and starch in soil for orchid growing. Statistical analysis of data show excellent correlation between degree of degradation and percentage of grafting for graft copolymers of polystyrene and starch and share of starch in copolymers which is necessary to biodegradation started and share of polystyrene in copolymers that prevented biodegradation.",
publisher = "Универзитет у Београду, Хемијски факултет",
journal = "Универзитет у Београду",
title = "Kopolimeri dobijeni kalemljenjem vinilnih monomera na skrob - uticaj amina na sintezu i procesi degradacije u životnoj sredini, Copolumers obtained by grafting of vinyl monomers on starch - influence of amines on synthesis and degradation processes in environment",
url = "https://hdl.handle.net/21.15107/rcub_nardus_3478"
}

Nikolić, V.. (2013). Kopolimeri dobijeni kalemljenjem vinilnih monomera na skrob - uticaj amina na sintezu i procesi degradacije u životnoj sredini. in Универзитет у Београду
Универзитет у Београду, Хемијски факултет..
https://hdl.handle.net/21.15107/rcub_nardus_3478

Nikolić V. Kopolimeri dobijeni kalemljenjem vinilnih monomera na skrob - uticaj amina na sintezu i procesi degradacije u životnoj sredini. in Универзитет у Београду. 2013;.
https://hdl.handle.net/21.15107/rcub_nardus_3478 .

Nikolić, Vladimir, "Kopolimeri dobijeni kalemljenjem vinilnih monomera na skrob - uticaj amina na sintezu i procesi degradacije u životnoj sredini" in Универзитет у Београду (2013),
https://hdl.handle.net/21.15107/rcub_nardus_3478 .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2012
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1280
AB  - The aim of this work was synthesis of grafted copolymers of poly(methacrylic acid) and starch (PMAA-graft-starch) with high percentage of grafting, G (%). The effect of temperature (55-75 degrees C), concentration of methacrylic acid monomer (0.775-1.452 mol/dm(3)), amount of initiator potassium persulfate (PPS) (0.00075-0.0025 mol), reaction time (30-270 min) and nature and amount (0.001-0.005 mol) of amine activator on percentage of grafting were investigated. The following amine activators were used: N,N-dimethylaminoethanol. N,N-diethylaminoethanol, triethylamine, propylamine, iso-butylamine, pentylamine, hexylamine, 4-(2-hidroxyethyl) morpholine and 1-(2-hidroxyethyl) piperazine. The graft copolymer was characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The highest G was 40.92%. Reaction conditions were as follows: 10.00 g of starch, monomer concentration was 0.775 mol/dm(3), temperature of 70 degrees C, the amount of PPS was 0.001 mol. The 4-(2-hidroxyethyl) morpholine was used as amine activator in amount of 0.001 mol. (C) 2012 Elsevier Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Amine activators influence on grafting reaction between methacrylic acid and starch
VL  - 88
IS  - 4
SP  - 1407
EP  - 1413
DO  - 10.1016/j.carbpol.2012.02.027
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2012",
abstract = "The aim of this work was synthesis of grafted copolymers of poly(methacrylic acid) and starch (PMAA-graft-starch) with high percentage of grafting, G (%). The effect of temperature (55-75 degrees C), concentration of methacrylic acid monomer (0.775-1.452 mol/dm(3)), amount of initiator potassium persulfate (PPS) (0.00075-0.0025 mol), reaction time (30-270 min) and nature and amount (0.001-0.005 mol) of amine activator on percentage of grafting were investigated. The following amine activators were used: N,N-dimethylaminoethanol. N,N-diethylaminoethanol, triethylamine, propylamine, iso-butylamine, pentylamine, hexylamine, 4-(2-hidroxyethyl) morpholine and 1-(2-hidroxyethyl) piperazine. The graft copolymer was characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The highest G was 40.92%. Reaction conditions were as follows: 10.00 g of starch, monomer concentration was 0.775 mol/dm(3), temperature of 70 degrees C, the amount of PPS was 0.001 mol. The 4-(2-hidroxyethyl) morpholine was used as amine activator in amount of 0.001 mol. (C) 2012 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Amine activators influence on grafting reaction between methacrylic acid and starch",
volume = "88",
number = "4",
pages = "1407-1413",
doi = "10.1016/j.carbpol.2012.02.027"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2012). Amine activators influence on grafting reaction between methacrylic acid and starch. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 88(4), 1407-1413.
https://doi.org/10.1016/j.carbpol.2012.02.027

Nikolić V, Veličković S, Popović AR. Amine activators influence on grafting reaction between methacrylic acid and starch. in Carbohydrate Polymers. 2012;88(4):1407-1413.
doi:10.1016/j.carbpol.2012.02.027 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Amine activators influence on grafting reaction between methacrylic acid and starch" in Carbohydrate Polymers, 88, no. 4 (2012):1407-1413,
https://doi.org/10.1016/j.carbpol.2012.02.027 . .