TY  - JOUR
AU  - Ristić, Ivan
AU  - Jotanović, Milovan
AU  - Erceg, Tamara
AU  - Nikolić, Ljubiša
AU  - Cakić, Suzana
AU  - Mićić, Vladan
AU  - Pavlović, Stefan
AU  - Begić, Sabina
PY  - 2019
UR  - http://savremenimaterijali.info/index.php?idsek=223
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3806
AB  - The consequence of drastic reduction in fossil fuel reserves has forced the
scientific community to find and develop new ways to exploit renewable resources and
optimize the process of polymer materials production. The aim is to obtain applicable
polymer whose complete life cycle is set in ecological framework. Poly(lactide) (PLA)
meets these requirements as biodegradable polyester whose monomer is derived from the
plant feedstock containing carbohydrates. PLA could be prepared using the different
synthesis routes, but from the point of energy saving, as well as environmental protection,
the microwave synthesis of PLA is the best solution. In this work, poly(L-lactide) were
synthesized in microwave reactor. Reaction time was varied, while the other parameters of
the synthesis were constant. The structures of obtained polymers were confirmed by Fourier
– transform infrared spectroscopy (FT-IR). For determination of molar masses of poly(Llactide) samples, the gel permeation chromatography (GPC) was applied. Thermal
properties were investigated by differential scanning calorimetry (DSC).
PB  - Бања Лука: Академија наука и умјетности РС
T2  - Contemporary Materials
T1  - The influence of reaction time on the properties of microwave synthesized poly(lactide)
VL  - 10
IS  - 1
SP  - 56
EP  - 63
DO  - 10.7251/COMEN1901056R
ER  - 

@article{
author = "Ristić, Ivan and Jotanović, Milovan and Erceg, Tamara and Nikolić, Ljubiša and Cakić, Suzana and Mićić, Vladan and Pavlović, Stefan and Begić, Sabina",
year = "2019",
abstract = "The consequence of drastic reduction in fossil fuel reserves has forced the
scientific community to find and develop new ways to exploit renewable resources and
optimize the process of polymer materials production. The aim is to obtain applicable
polymer whose complete life cycle is set in ecological framework. Poly(lactide) (PLA)
meets these requirements as biodegradable polyester whose monomer is derived from the
plant feedstock containing carbohydrates. PLA could be prepared using the different
synthesis routes, but from the point of energy saving, as well as environmental protection,
the microwave synthesis of PLA is the best solution. In this work, poly(L-lactide) were
synthesized in microwave reactor. Reaction time was varied, while the other parameters of
the synthesis were constant. The structures of obtained polymers were confirmed by Fourier
– transform infrared spectroscopy (FT-IR). For determination of molar masses of poly(Llactide) samples, the gel permeation chromatography (GPC) was applied. Thermal
properties were investigated by differential scanning calorimetry (DSC).",
publisher = "Бања Лука: Академија наука и умјетности РС",
journal = "Contemporary Materials",
title = "The influence of reaction time on the properties of microwave synthesized poly(lactide)",
volume = "10",
number = "1",
pages = "56-63",
doi = "10.7251/COMEN1901056R"
}

Ristić, I., Jotanović, M., Erceg, T., Nikolić, L., Cakić, S., Mićić, V., Pavlović, S.,& Begić, S.. (2019). The influence of reaction time on the properties of microwave synthesized poly(lactide). in Contemporary Materials
Бања Лука: Академија наука и умјетности РС., 10(1), 56-63.
https://doi.org/10.7251/COMEN1901056R

Ristić I, Jotanović M, Erceg T, Nikolić L, Cakić S, Mićić V, Pavlović S, Begić S. The influence of reaction time on the properties of microwave synthesized poly(lactide). in Contemporary Materials. 2019;10(1):56-63.
doi:10.7251/COMEN1901056R .

Ristić, Ivan, Jotanović, Milovan, Erceg, Tamara, Nikolić, Ljubiša, Cakić, Suzana, Mićić, Vladan, Pavlović, Stefan, Begić, Sabina, "The influence of reaction time on the properties of microwave synthesized poly(lactide)" in Contemporary Materials, 10, no. 1 (2019):56-63,
https://doi.org/10.7251/COMEN1901056R . .

TY  - CONF
AU  - Ristić, Ivan
AU  - Jotanović, Milovan
AU  - Erceg, Tamara
AU  - Nikolić, Ljubiša
AU  - Cakić, Suzana
AU  - Mićić, Vladan
AU  - Pavlović, Stefan
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3797
AB  - The world is faced with the consequences of drastic reduction in fossil fuel reserves, because of their widespread use, not only as an energy source, but also as a feedstock for monomers obtaining. In order to solve this problem, the scientific community has focused on finding the new ways to exploit renewable resources and optimize the process of polymer materials production. The aim is to obtain applicable polymer whose complete life cycle is put in ecological framework. Poly(lactide) (PLA) meets these requirements as biodegradable polyester whose monomer is derived from plant feedstock containing carbohydrates. Different methods can be applied for PLA synthesis, but from the point of energy saving, as well as environmental protection, the microwave synthesis of PLA is the best solution. The use of microwaves enables homogenous heating of reaction mixture, lower consumption of organic solvent and drastic reduction in polymerization time, obtaining, in the same time, high molecular weight polymers.
PB  - University of Maribor Press
C3  - Materials: (conference proceedings) - 10th International Conference on Sustainable Energy and Environmental Protection
T1  - Energy Efficient Poly(Lactide) Obtaining by Microwave Synthesis
SP  - 43
EP  - 49
DO  - 10.18690/978-961-286-056-1.6
ER  - 

@conference{
author = "Ristić, Ivan and Jotanović, Milovan and Erceg, Tamara and Nikolić, Ljubiša and Cakić, Suzana and Mićić, Vladan and Pavlović, Stefan",
year = "2017",
abstract = "The world is faced with the consequences of drastic reduction in fossil fuel reserves, because of their widespread use, not only as an energy source, but also as a feedstock for monomers obtaining. In order to solve this problem, the scientific community has focused on finding the new ways to exploit renewable resources and optimize the process of polymer materials production. The aim is to obtain applicable polymer whose complete life cycle is put in ecological framework. Poly(lactide) (PLA) meets these requirements as biodegradable polyester whose monomer is derived from plant feedstock containing carbohydrates. Different methods can be applied for PLA synthesis, but from the point of energy saving, as well as environmental protection, the microwave synthesis of PLA is the best solution. The use of microwaves enables homogenous heating of reaction mixture, lower consumption of organic solvent and drastic reduction in polymerization time, obtaining, in the same time, high molecular weight polymers.",
publisher = "University of Maribor Press",
journal = "Materials: (conference proceedings) - 10th International Conference on Sustainable Energy and Environmental Protection",
title = "Energy Efficient Poly(Lactide) Obtaining by Microwave Synthesis",
pages = "43-49",
doi = "10.18690/978-961-286-056-1.6"
}

Ristić, I., Jotanović, M., Erceg, T., Nikolić, L., Cakić, S., Mićić, V.,& Pavlović, S.. (2017). Energy Efficient Poly(Lactide) Obtaining by Microwave Synthesis. in Materials: (conference proceedings) - 10th International Conference on Sustainable Energy and Environmental Protection
University of Maribor Press., 43-49.
https://doi.org/10.18690/978-961-286-056-1.6

Ristić I, Jotanović M, Erceg T, Nikolić L, Cakić S, Mićić V, Pavlović S. Energy Efficient Poly(Lactide) Obtaining by Microwave Synthesis. in Materials: (conference proceedings) - 10th International Conference on Sustainable Energy and Environmental Protection. 2017;:43-49.
doi:10.18690/978-961-286-056-1.6 .

Ristić, Ivan, Jotanović, Milovan, Erceg, Tamara, Nikolić, Ljubiša, Cakić, Suzana, Mićić, Vladan, Pavlović, Stefan, "Energy Efficient Poly(Lactide) Obtaining by Microwave Synthesis" in Materials: (conference proceedings) - 10th International Conference on Sustainable Energy and Environmental Protection (2017):43-49,
https://doi.org/10.18690/978-961-286-056-1.6 . .

TY  - JOUR
AU  - Nikolić, Ljubiša
AU  - Stanković, Miroslav
AU  - Nikolić, Vesna
AU  - Todorović, Zoran
AU  - Vuković, Zorica
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/254
AB  - A synthesis of porous poly(methylmetacrylate) in suspension has been done in this paper. Ethylene glycol dimethacrylate has been used as a crosslinker poly(vinyl-pyrrolidone) as a protective colloid, and a benzoyl peroxide as an initiator. The synthesized polymer has been investigated by Carlo Erba 2000 to determine it's porosity, specific surface and pore size distribution. These parameters depend on concentrations of crosslinkers and the inert pores-making agent ethyl acetate. The porosity of poly(methylmetacrylate) increases proportionally with ethyl acetate concentration in the reaction mixture, reaching the maximum value of 0.614 cm3/g (corresponding to the maximum ethyl acetate concentration). Pore size distribution points the pores with diameters between 1 - 5 μm and specific surface of 17.187 m2/g as the most abundant ones. The synthesized polymers have been used for polymer–analog reactions, converting methyl-ester groups into acyl-hydrazine ones and these into acyl-azide groups. These reactions served as a tool to immobilize enzyme amylase. So, the porous poly(methylmetacrylate) has been used as the enzyme's inert support.
AB  - U ovom radu je izvršena sinteza poroznog poli(metilmetakrilata) u suspenziji pri čemu je etilenglikol dimetakrilat iskorišćen kao umreživač poli(vinilpirolidon) kao zaštitni koloid, a benzoil peroksid kao inicijator. Dobijenom polimeru je na uređaju Carlo Erba 2000 određena poroznost specifična površina i raspodela veličina pora. Ove veličine zavise od koncentracije umreživača i koncentracije inertne komponente za stvaranje pora - etilacetata. Poroznost poli(metilmetakrilata) se uvećava sa povećanjem koncentracije etilacetata u reakcionoj smeši i za najveću koncentraciju dostiže 0,614 cm3/g. Raspodela veličina pora pokazuje da su najzastupljenije pore prečnika 0,1 do 5 μm, a specifična površina dostiže 17,187 m2/g. Na dobijenom polimeru izvedene su polimer-analogne reakcije kojima su metilestarske grupe prevedene u acil-hidrazinske, a ove u acil-azidne grupe. Preko njih je imobilisan enzim amilaza, tako da je ovaj porozni poli(metilmetakrilat) iskorišćen kao inertni nosač enzima.
PB  - Društvo inženjera plastičara i gumara, Beograd
T2  - Svet polimera
T1  - Synthesis of porous poly(methylmetacrylate)
T1  - Sinteza poroznog poli(metilmetakrilata)
VL  - 9
IS  - 3
SP  - 73
EP  - 76
UR  - https://hdl.handle.net/21.15107/rcub_cer_254
ER  - 

@article{
author = "Nikolić, Ljubiša and Stanković, Miroslav and Nikolić, Vesna and Todorović, Zoran and Vuković, Zorica",
year = "2006",
abstract = "A synthesis of porous poly(methylmetacrylate) in suspension has been done in this paper. Ethylene glycol dimethacrylate has been used as a crosslinker poly(vinyl-pyrrolidone) as a protective colloid, and a benzoyl peroxide as an initiator. The synthesized polymer has been investigated by Carlo Erba 2000 to determine it's porosity, specific surface and pore size distribution. These parameters depend on concentrations of crosslinkers and the inert pores-making agent ethyl acetate. The porosity of poly(methylmetacrylate) increases proportionally with ethyl acetate concentration in the reaction mixture, reaching the maximum value of 0.614 cm3/g (corresponding to the maximum ethyl acetate concentration). Pore size distribution points the pores with diameters between 1 - 5 μm and specific surface of 17.187 m2/g as the most abundant ones. The synthesized polymers have been used for polymer–analog reactions, converting methyl-ester groups into acyl-hydrazine ones and these into acyl-azide groups. These reactions served as a tool to immobilize enzyme amylase. So, the porous poly(methylmetacrylate) has been used as the enzyme's inert support., U ovom radu je izvršena sinteza poroznog poli(metilmetakrilata) u suspenziji pri čemu je etilenglikol dimetakrilat iskorišćen kao umreživač poli(vinilpirolidon) kao zaštitni koloid, a benzoil peroksid kao inicijator. Dobijenom polimeru je na uređaju Carlo Erba 2000 određena poroznost specifična površina i raspodela veličina pora. Ove veličine zavise od koncentracije umreživača i koncentracije inertne komponente za stvaranje pora - etilacetata. Poroznost poli(metilmetakrilata) se uvećava sa povećanjem koncentracije etilacetata u reakcionoj smeši i za najveću koncentraciju dostiže 0,614 cm3/g. Raspodela veličina pora pokazuje da su najzastupljenije pore prečnika 0,1 do 5 μm, a specifična površina dostiže 17,187 m2/g. Na dobijenom polimeru izvedene su polimer-analogne reakcije kojima su metilestarske grupe prevedene u acil-hidrazinske, a ove u acil-azidne grupe. Preko njih je imobilisan enzim amilaza, tako da je ovaj porozni poli(metilmetakrilat) iskorišćen kao inertni nosač enzima.",
publisher = "Društvo inženjera plastičara i gumara, Beograd",
journal = "Svet polimera",
title = "Synthesis of porous poly(methylmetacrylate), Sinteza poroznog poli(metilmetakrilata)",
volume = "9",
number = "3",
pages = "73-76",
url = "https://hdl.handle.net/21.15107/rcub_cer_254"
}

Nikolić, L., Stanković, M., Nikolić, V., Todorović, Z.,& Vuković, Z.. (2006). Synthesis of porous poly(methylmetacrylate). in Svet polimera
Društvo inženjera plastičara i gumara, Beograd., 9(3), 73-76.
https://hdl.handle.net/21.15107/rcub_cer_254

Nikolić L, Stanković M, Nikolić V, Todorović Z, Vuković Z. Synthesis of porous poly(methylmetacrylate). in Svet polimera. 2006;9(3):73-76.
https://hdl.handle.net/21.15107/rcub_cer_254 .

Nikolić, Ljubiša, Stanković, Miroslav, Nikolić, Vesna, Todorović, Zoran, Vuković, Zorica, "Synthesis of porous poly(methylmetacrylate)" in Svet polimera, 9, no. 3 (2006):73-76,
https://hdl.handle.net/21.15107/rcub_cer_254 .

TY  - JOUR
AU  - Nikolić, Ljubiša
AU  - Nikolić, Vesna
AU  - Stanković, Miroslav
AU  - Todorović, Zoran
AU  - Vuković, Zorica
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/239
AB  - The characteristics of two types of porous polymers: poly(methyl methacrylate) and copolymers of methyl methacrylate and acrylamide were investigated in this study. Poly(methyl methacrylate) was synthesized in suspension, using ethylene glycol dimethacrylate as the cross-linking agent, poly(vinyl pyrrolidone) as the protective colloid, and benzoyl peroxide as the initiator. The synthesis of poly(methyl methacrylate-co-acrylamide) was initiated in emulsion in the presence of dioctyl sulfosuccinate sodium salt, followed by a sol-gel process, and completely reacted to the solid state. Potassium persulfate was used as the initiator, and tetramethylol glycoluril as the cross-linking agent. Both types of syntheses were carried out in the presence of ethyl acetate. The porosity, specific surface and distribution of the pore sizes of the obtained polymers were determined by mercury porosimetry. The polymers were used as inert carriers for the immobilization of enzymes and whole cells of Saccharomyces cerevisiae yeast.
AB  - U ovom radu su ispitivane karakteristike dve vrste poroznih polimera: poli(metilmetakrilata) i kopolimera metilmetakrilata i akrilamida. Poli(metilmetakrilat) je sintetisan u suspenziji pri čemu je etilenglikol dimetakrilat iskorišćen kao umreživač, poli(vinilpirolidon) kao zaštitni koloid a benzoil peroksid kao inicijator. Sinteza poli(metilmetakrilat-co-akrilamida) je započeta u emulziji u prisustvu natrijum dioktil sulfosukcinata, nastavljena sol-gel procesom i završila u čvrstom stanju. Kao inicijator je korišćen kalijum persulfat, a tetrametilol glikoluril kao umreživač. Obe vrste sinteze su vođene u prisustvu etil acetata. Dobijenim polimerima je određena poroznost, specifična površina i raspodela veličina pora pomoću živine porozimetrije. Iskorišćeni su kao inertni nosači za /mobilizaciju enzima i celih ćelija kvasca Saccharomyces cerevisiae.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Porous poly(methylmethacrylate) and poly(methylmethacrylate-co-acrylamide)
T1  - Porozni poli(metilmetakrilat) i poli(metilmetakrilat-co-akrilamid)
VL  - 60
IS  - 11-12
SP  - 327
EP  - 332
DO  - 10.2298/HEMIND0612327N
ER  - 

@article{
author = "Nikolić, Ljubiša and Nikolić, Vesna and Stanković, Miroslav and Todorović, Zoran and Vuković, Zorica",
year = "2006",
abstract = "The characteristics of two types of porous polymers: poly(methyl methacrylate) and copolymers of methyl methacrylate and acrylamide were investigated in this study. Poly(methyl methacrylate) was synthesized in suspension, using ethylene glycol dimethacrylate as the cross-linking agent, poly(vinyl pyrrolidone) as the protective colloid, and benzoyl peroxide as the initiator. The synthesis of poly(methyl methacrylate-co-acrylamide) was initiated in emulsion in the presence of dioctyl sulfosuccinate sodium salt, followed by a sol-gel process, and completely reacted to the solid state. Potassium persulfate was used as the initiator, and tetramethylol glycoluril as the cross-linking agent. Both types of syntheses were carried out in the presence of ethyl acetate. The porosity, specific surface and distribution of the pore sizes of the obtained polymers were determined by mercury porosimetry. The polymers were used as inert carriers for the immobilization of enzymes and whole cells of Saccharomyces cerevisiae yeast., U ovom radu su ispitivane karakteristike dve vrste poroznih polimera: poli(metilmetakrilata) i kopolimera metilmetakrilata i akrilamida. Poli(metilmetakrilat) je sintetisan u suspenziji pri čemu je etilenglikol dimetakrilat iskorišćen kao umreživač, poli(vinilpirolidon) kao zaštitni koloid a benzoil peroksid kao inicijator. Sinteza poli(metilmetakrilat-co-akrilamida) je započeta u emulziji u prisustvu natrijum dioktil sulfosukcinata, nastavljena sol-gel procesom i završila u čvrstom stanju. Kao inicijator je korišćen kalijum persulfat, a tetrametilol glikoluril kao umreživač. Obe vrste sinteze su vođene u prisustvu etil acetata. Dobijenim polimerima je određena poroznost, specifična površina i raspodela veličina pora pomoću živine porozimetrije. Iskorišćeni su kao inertni nosači za /mobilizaciju enzima i celih ćelija kvasca Saccharomyces cerevisiae.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Porous poly(methylmethacrylate) and poly(methylmethacrylate-co-acrylamide), Porozni poli(metilmetakrilat) i poli(metilmetakrilat-co-akrilamid)",
volume = "60",
number = "11-12",
pages = "327-332",
doi = "10.2298/HEMIND0612327N"
}

Nikolić, L., Nikolić, V., Stanković, M., Todorović, Z.,& Vuković, Z.. (2006). Porous poly(methylmethacrylate) and poly(methylmethacrylate-co-acrylamide). in Hemijska industrija
Association of Chemical Engineers of Serbia., 60(11-12), 327-332.
https://doi.org/10.2298/HEMIND0612327N

Nikolić L, Nikolić V, Stanković M, Todorović Z, Vuković Z. Porous poly(methylmethacrylate) and poly(methylmethacrylate-co-acrylamide). in Hemijska industrija. 2006;60(11-12):327-332.
doi:10.2298/HEMIND0612327N .

Nikolić, Ljubiša, Nikolić, Vesna, Stanković, Miroslav, Todorović, Zoran, Vuković, Zorica, "Porous poly(methylmethacrylate) and poly(methylmethacrylate-co-acrylamide)" in Hemijska industrija, 60, no. 11-12 (2006):327-332,
https://doi.org/10.2298/HEMIND0612327N . .