TY  - JOUR
AU  - Kalagasidis Krušić, Melina
AU  - Veličković, Sava
AU  - Griffiths, Peter C.
AU  - Filipović, Jovanka
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1682
AB  - The aim of the work reported here was to investigate temperature- and pH-sensitive hydrogels of N-isopropylacrylamide (NIPAM) and itaconic acid (IA) and their semi-interpenetrating polymer networks (semi-IPNs) with varying contents of poly(ethylene glycol) (PEG). The stimuli responsiveness, swelling behaviour and mechanical properties of the hydrogels and semi-IPNs were studied in order to investigate the effect of various amounts of PEG. Pulsed-gradient spin-echo NMR experiments were carried out to investigate the diffusion process. The pH sensitivity increased with an increasing amount of PEG in the semi-IPNs, while the overall rate of water uptake was diffusion-controlled (n  lt  0.5). For certain PEG contents (5 and 10 wt%), the semi-IPNs exhibited better mechanical properties than the poly(NIPAM-co-IA) copolymer. The calculated values of the self-diffusion coefficients of water indicated facilitated diffusion of water through the system with increased amounts of PEG, while the self-diffusion coefficients of a model compound, metoprolol tartrate, showed no significant dependence on the amount of PEG. According to the results obtained and compared to results reported in the literature, the investigated semi-IPNs may have potential applications in the controlled release of macromolecular active agents such as proteins and peptides.
PB  - Wiley, Hoboken
T2  - Polymer International
T1  - Poly[(N-isopropylacrylamide)-co-(itaconic acid)] hydrogels with poly(ethylene glycol)
EP  - 262
IS  - 2
SP  - 256
VL  - 59
DO  - 10.1002/pi.2717
ER  - 

@article{
author = "Kalagasidis Krušić, Melina and Veličković, Sava and Griffiths, Peter C. and Filipović, Jovanka",
year = "2010",
abstract = "The aim of the work reported here was to investigate temperature- and pH-sensitive hydrogels of N-isopropylacrylamide (NIPAM) and itaconic acid (IA) and their semi-interpenetrating polymer networks (semi-IPNs) with varying contents of poly(ethylene glycol) (PEG). The stimuli responsiveness, swelling behaviour and mechanical properties of the hydrogels and semi-IPNs were studied in order to investigate the effect of various amounts of PEG. Pulsed-gradient spin-echo NMR experiments were carried out to investigate the diffusion process. The pH sensitivity increased with an increasing amount of PEG in the semi-IPNs, while the overall rate of water uptake was diffusion-controlled (n  lt  0.5). For certain PEG contents (5 and 10 wt%), the semi-IPNs exhibited better mechanical properties than the poly(NIPAM-co-IA) copolymer. The calculated values of the self-diffusion coefficients of water indicated facilitated diffusion of water through the system with increased amounts of PEG, while the self-diffusion coefficients of a model compound, metoprolol tartrate, showed no significant dependence on the amount of PEG. According to the results obtained and compared to results reported in the literature, the investigated semi-IPNs may have potential applications in the controlled release of macromolecular active agents such as proteins and peptides.",
publisher = "Wiley, Hoboken",
journal = "Polymer International",
title = "Poly[(N-isopropylacrylamide)-co-(itaconic acid)] hydrogels with poly(ethylene glycol)",
pages = "262-256",
number = "2",
volume = "59",
doi = "10.1002/pi.2717"
}

Kalagasidis Krušić, M., Veličković, S., Griffiths, P. C.,& Filipović, J.. (2010). Poly[(N-isopropylacrylamide)-co-(itaconic acid)] hydrogels with poly(ethylene glycol). in Polymer International
Wiley, Hoboken., 59(2), 256-262.
https://doi.org/10.1002/pi.2717

Kalagasidis Krušić M, Veličković S, Griffiths PC, Filipović J. Poly[(N-isopropylacrylamide)-co-(itaconic acid)] hydrogels with poly(ethylene glycol). in Polymer International. 2010;59(2):256-262.
doi:10.1002/pi.2717 .

Kalagasidis Krušić, Melina, Veličković, Sava, Griffiths, Peter C., Filipović, Jovanka, "Poly[(N-isopropylacrylamide)-co-(itaconic acid)] hydrogels with poly(ethylene glycol)" in Polymer International, 59, no. 2 (2010):256-262,
https://doi.org/10.1002/pi.2717 . .

TY  - JOUR
AU  - Veličković, Sava
AU  - Džunuzović, Enis
AU  - Griffiths, Peter C.
AU  - Lacik, I.
AU  - Filipović, Jovanka
AU  - Popović, Ivanka
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1224
AB  - The synthesis and characterization of poly (itaconic acid) (PIA) with a novel initiator/activator system is presented. The initiator in this system was potassium persulfate, whereas the activator was N,N-dimethylethanolamine (DMEA). PIA was synthesized indistilled water and in 0.1M HCl at 40 degrees C with reaction times of 72 and 96 h. PIA was investigated with differential scanning calorimetry, gel permeation chromatography, and pulse gradient spin echo-NMR and compared to the same polymer synthesized in dioxane with 2,2'-azobisiso-butyronitrile as the initiator. It was shown that, despite the fact that some residual DMEA remained in the system, the properties of the PIA polymerized in the aqueous phase were very similar to the dioxane-synthesized polymer, which will enable a faster, cheaper, and environmentally more acceptable polymerization of itaconic acid.
PB  - Wiley, Hoboken
T2  - Journal of Applied Polymer Science
T1  - Polymerization of Itaconic Acid Initiated by a Potassium Persulfate/N,N-Dimethylethanolamine System
EP  - 3282
IS  - 5
SP  - 3275
VL  - 110
DO  - 10.1002/app.28843
ER  - 

@article{
author = "Veličković, Sava and Džunuzović, Enis and Griffiths, Peter C. and Lacik, I. and Filipović, Jovanka and Popović, Ivanka",
year = "2008",
abstract = "The synthesis and characterization of poly (itaconic acid) (PIA) with a novel initiator/activator system is presented. The initiator in this system was potassium persulfate, whereas the activator was N,N-dimethylethanolamine (DMEA). PIA was synthesized indistilled water and in 0.1M HCl at 40 degrees C with reaction times of 72 and 96 h. PIA was investigated with differential scanning calorimetry, gel permeation chromatography, and pulse gradient spin echo-NMR and compared to the same polymer synthesized in dioxane with 2,2'-azobisiso-butyronitrile as the initiator. It was shown that, despite the fact that some residual DMEA remained in the system, the properties of the PIA polymerized in the aqueous phase were very similar to the dioxane-synthesized polymer, which will enable a faster, cheaper, and environmentally more acceptable polymerization of itaconic acid.",
publisher = "Wiley, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "Polymerization of Itaconic Acid Initiated by a Potassium Persulfate/N,N-Dimethylethanolamine System",
pages = "3282-3275",
number = "5",
volume = "110",
doi = "10.1002/app.28843"
}

Veličković, S., Džunuzović, E., Griffiths, P. C., Lacik, I., Filipović, J.,& Popović, I.. (2008). Polymerization of Itaconic Acid Initiated by a Potassium Persulfate/N,N-Dimethylethanolamine System. in Journal of Applied Polymer Science
Wiley, Hoboken., 110(5), 3275-3282.
https://doi.org/10.1002/app.28843

Veličković S, Džunuzović E, Griffiths PC, Lacik I, Filipović J, Popović I. Polymerization of Itaconic Acid Initiated by a Potassium Persulfate/N,N-Dimethylethanolamine System. in Journal of Applied Polymer Science. 2008;110(5):3275-3282.
doi:10.1002/app.28843 .

Veličković, Sava, Džunuzović, Enis, Griffiths, Peter C., Lacik, I., Filipović, Jovanka, Popović, Ivanka, "Polymerization of Itaconic Acid Initiated by a Potassium Persulfate/N,N-Dimethylethanolamine System" in Journal of Applied Polymer Science, 110, no. 5 (2008):3275-3282,
https://doi.org/10.1002/app.28843 . .

TY  - JOUR
AU  - Veličković, Sava
AU  - Kalagasidis Krušić, Melina
AU  - Pjanović, Rada
AU  - Bošković-Vragolović, Nevenka
AU  - Griffiths, Peter C.
AU  - Popović, Ivanka
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/829
AB  - The diffusion of water into solid poly(ditetrahydrofurfuryl itaconate) (PDTFI) films and in analogous polymer solutions was measured. Diffusion into solid PDTFI films on a glass support was measured in three solutions of different pH (4, 7 and 10) at 37 and 60 degrees C during a 90 day period. The uptake was high and was both pH and. temperature dependent, ranging from 120 to 2000%. A Fickian mechanism is observed for the initial stages of uptake, whilst a non-Fickian mechanism is present when the equilibrium is approached. The pH 7 samples did not equilibrate at any temperature during the experiment. The FTIR investigations of the films indicated some deesterification took place during the uptake. The diffusion coefficients and diffusion exponents are calculated for the samples. The diffusion of water into PDTFI solution in acetone was measured by PGSE-NMR, showing the expected linear attenuation functions. The diffusion coefficient of water was calculated for polymer concentrations up to 10%.
PB  - Elsevier Sci Ltd, Oxford
T2  - Polymer
T1  - The diffusion of water in poly(ditetrahydrofurfuryl itaconate)
EP  - 7988
IS  - 19
SP  - 7982
VL  - 46
DO  - 10.1016/j.polymer.2005.06.110
ER  - 

@article{
author = "Veličković, Sava and Kalagasidis Krušić, Melina and Pjanović, Rada and Bošković-Vragolović, Nevenka and Griffiths, Peter C. and Popović, Ivanka",
year = "2005",
abstract = "The diffusion of water into solid poly(ditetrahydrofurfuryl itaconate) (PDTFI) films and in analogous polymer solutions was measured. Diffusion into solid PDTFI films on a glass support was measured in three solutions of different pH (4, 7 and 10) at 37 and 60 degrees C during a 90 day period. The uptake was high and was both pH and. temperature dependent, ranging from 120 to 2000%. A Fickian mechanism is observed for the initial stages of uptake, whilst a non-Fickian mechanism is present when the equilibrium is approached. The pH 7 samples did not equilibrate at any temperature during the experiment. The FTIR investigations of the films indicated some deesterification took place during the uptake. The diffusion coefficients and diffusion exponents are calculated for the samples. The diffusion of water into PDTFI solution in acetone was measured by PGSE-NMR, showing the expected linear attenuation functions. The diffusion coefficient of water was calculated for polymer concentrations up to 10%.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Polymer",
title = "The diffusion of water in poly(ditetrahydrofurfuryl itaconate)",
pages = "7988-7982",
number = "19",
volume = "46",
doi = "10.1016/j.polymer.2005.06.110"
}

Veličković, S., Kalagasidis Krušić, M., Pjanović, R., Bošković-Vragolović, N., Griffiths, P. C.,& Popović, I.. (2005). The diffusion of water in poly(ditetrahydrofurfuryl itaconate). in Polymer
Elsevier Sci Ltd, Oxford., 46(19), 7982-7988.
https://doi.org/10.1016/j.polymer.2005.06.110

Veličković S, Kalagasidis Krušić M, Pjanović R, Bošković-Vragolović N, Griffiths PC, Popović I. The diffusion of water in poly(ditetrahydrofurfuryl itaconate). in Polymer. 2005;46(19):7982-7988.
doi:10.1016/j.polymer.2005.06.110 .

Veličković, Sava, Kalagasidis Krušić, Melina, Pjanović, Rada, Bošković-Vragolović, Nevenka, Griffiths, Peter C., Popović, Ivanka, "The diffusion of water in poly(ditetrahydrofurfuryl itaconate)" in Polymer, 46, no. 19 (2005):7982-7988,
https://doi.org/10.1016/j.polymer.2005.06.110 . .