TY  - JOUR
AU  - Ilić-Stojanović, Snežana
AU  - Urošević, Maja
AU  - Nikolić, Ljubiša
AU  - Petrović, Đorđe
AU  - Stanojević, Jelena
AU  - Najman, Stevo
AU  - Nikolić, Vesna
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9033
AB  - Poly(N-isopropylmethacrylamide) (p(NiPMAm)) is one of the lesser known homopolymers that has significant potential for designing new “intelligent” materials. The aims of this work were the synthesis a series of cross-linked p(NiPMAm) hydrogels by the free radical polymerization method and the application of gamma-ray radiation for additional cross-linking. The synthesized p(NiPMAm) hydrogels were structurally characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The amount of unreacted monomers was analyzed using high pressure liquid chromatography (HPLC) to evaluate conversion of monomers into polymers. The swelling behavior was monitored in dependence of pH and temperature changes. The previous aim of gamma-ray radiation was the further the cross-linkage of the obtained hydrogel sample in the gelatinous, paste-like state, but the gamma-ray radiation caused decomposition. After absorbing irradiation doses, they transformed into the liquid phase. The results obtained by the gel permeation chromatography (GPC) method indicated that only oligomers and monomers were present in the irradiated liquid material, without molecules with a higher average molar mass, i.e., that the decomposition of the hydrogels occurred. Additionally, the irradiated liquid material was analyzed using the static headspace gas chromatography mass spectrometry (HSS-GC/MS) and gas chromatography/flame ionization detection (HSS-GC/FID) methods. The presence of unchanged initiator molecule and a dominant amount of four new molecules that were different from homopolymers and the reactant (monomer and cross-linker) were determined.
T2  - Polymers
T1  - Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition
VL  - 12
IS  - 5
SP  - 1112
DO  - 10.3390/polym12051112
ER  - 

@article{
author = "Ilić-Stojanović, Snežana and Urošević, Maja and Nikolić, Ljubiša and Petrović, Đorđe and Stanojević, Jelena and Najman, Stevo and Nikolić, Vesna",
year = "2020",
abstract = "Poly(N-isopropylmethacrylamide) (p(NiPMAm)) is one of the lesser known homopolymers that has significant potential for designing new “intelligent” materials. The aims of this work were the synthesis a series of cross-linked p(NiPMAm) hydrogels by the free radical polymerization method and the application of gamma-ray radiation for additional cross-linking. The synthesized p(NiPMAm) hydrogels were structurally characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The amount of unreacted monomers was analyzed using high pressure liquid chromatography (HPLC) to evaluate conversion of monomers into polymers. The swelling behavior was monitored in dependence of pH and temperature changes. The previous aim of gamma-ray radiation was the further the cross-linkage of the obtained hydrogel sample in the gelatinous, paste-like state, but the gamma-ray radiation caused decomposition. After absorbing irradiation doses, they transformed into the liquid phase. The results obtained by the gel permeation chromatography (GPC) method indicated that only oligomers and monomers were present in the irradiated liquid material, without molecules with a higher average molar mass, i.e., that the decomposition of the hydrogels occurred. Additionally, the irradiated liquid material was analyzed using the static headspace gas chromatography mass spectrometry (HSS-GC/MS) and gas chromatography/flame ionization detection (HSS-GC/FID) methods. The presence of unchanged initiator molecule and a dominant amount of four new molecules that were different from homopolymers and the reactant (monomer and cross-linker) were determined.",
journal = "Polymers",
title = "Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition",
volume = "12",
number = "5",
pages = "1112",
doi = "10.3390/polym12051112"
}

Ilić-Stojanović, S., Urošević, M., Nikolić, L., Petrović, Đ., Stanojević, J., Najman, S.,& Nikolić, V.. (2020). Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition. in Polymers, 12(5), 1112.
https://doi.org/10.3390/polym12051112

Ilić-Stojanović S, Urošević M, Nikolić L, Petrović Đ, Stanojević J, Najman S, Nikolić V. Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition. in Polymers. 2020;12(5):1112.
doi:10.3390/polym12051112 .

Ilić-Stojanović, Snežana, Urošević, Maja, Nikolić, Ljubiša, Petrović, Đorđe, Stanojević, Jelena, Najman, Stevo, Nikolić, Vesna, "Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition" in Polymers, 12, no. 5 (2020):1112,
https://doi.org/10.3390/polym12051112 . .

TY  - JOUR
AU  - Nikolić, Lj.
AU  - Skala, Dejan
AU  - Nikolić, Vladimir M.
AU  - Stamenkovic, J
AU  - Babić, Dragan
AU  - Ilic-Stojanovic, S
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2690
AB  - In this work the synthesis of a crosslinked macroporous copolymer was effected from methyl methacrylate and acrylamide. The synthesis process began with emulsion prepolymerization, followed by sol-gel copolymerization until a hard block was obtained. Determination of the properties of the obtained material was carried out by FTIR, mercury porosimetry, and SEM microscopy. The material was characterized by a porous structure with open pores. The macroporous copolymer obtained can be used for polymer-analog reactions and the transformation of amide and ester groups into acyl azide groups. It can be used as a hard inert support for the immobilization of enzymes, or other proteins, by condensation of acyl azide group on poly-mer with the free amino group from the base amino acid of enzyme/protein. For the immobilization of microorganisms it can be used by vacuum diffusion of microorganism suspension into the porous structure, without active group transformation reactions. With microorganisms in the polymer pores, microorganism colonies form within the copolymer by microbial fermentation. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 387-395, 2004.
T2  - Journal of Applied Polymer Science
T1  - Methyl methacrylate and acrylamide crosslinked macroporous copolymers
VL  - 91
IS  - 1
SP  - 387
EP  - 395
DO  - 10.1002/app.13113
ER  - 

@article{
author = "Nikolić, Lj. and Skala, Dejan and Nikolić, Vladimir M. and Stamenkovic, J and Babić, Dragan and Ilic-Stojanovic, S",
year = "2004",
abstract = "In this work the synthesis of a crosslinked macroporous copolymer was effected from methyl methacrylate and acrylamide. The synthesis process began with emulsion prepolymerization, followed by sol-gel copolymerization until a hard block was obtained. Determination of the properties of the obtained material was carried out by FTIR, mercury porosimetry, and SEM microscopy. The material was characterized by a porous structure with open pores. The macroporous copolymer obtained can be used for polymer-analog reactions and the transformation of amide and ester groups into acyl azide groups. It can be used as a hard inert support for the immobilization of enzymes, or other proteins, by condensation of acyl azide group on poly-mer with the free amino group from the base amino acid of enzyme/protein. For the immobilization of microorganisms it can be used by vacuum diffusion of microorganism suspension into the porous structure, without active group transformation reactions. With microorganisms in the polymer pores, microorganism colonies form within the copolymer by microbial fermentation. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 387-395, 2004.",
journal = "Journal of Applied Polymer Science",
title = "Methyl methacrylate and acrylamide crosslinked macroporous copolymers",
volume = "91",
number = "1",
pages = "387-395",
doi = "10.1002/app.13113"
}

Nikolić, Lj., Skala, D., Nikolić, V. M., Stamenkovic, J., Babić, D.,& Ilic-Stojanovic, S.. (2004). Methyl methacrylate and acrylamide crosslinked macroporous copolymers. in Journal of Applied Polymer Science, 91(1), 387-395.
https://doi.org/10.1002/app.13113

Nikolić L, Skala D, Nikolić VM, Stamenkovic J, Babić D, Ilic-Stojanovic S. Methyl methacrylate and acrylamide crosslinked macroporous copolymers. in Journal of Applied Polymer Science. 2004;91(1):387-395.
doi:10.1002/app.13113 .

Nikolić, Lj., Skala, Dejan, Nikolić, Vladimir M., Stamenkovic, J, Babić, Dragan, Ilic-Stojanovic, S, "Methyl methacrylate and acrylamide crosslinked macroporous copolymers" in Journal of Applied Polymer Science, 91, no. 1 (2004):387-395,
https://doi.org/10.1002/app.13113 . .