TY  - JOUR
AU  - Spasojević, Pavle
AU  - Adnađević, Borivoj
AU  - Veličković, Sava
AU  - Jovanović, Jelena
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1926
AB  - The effects of heating mode (conventional isothermal heating (CIH) and microwave isothermal heating (MWIH) on the kinetics of polymerization and the properties important for the application (residual monomer, hardness, and water absorption) of three commercial poly(methyl methacrylate) (PMMA) base dental materials were investigated. The degree of monomer conversion was determined by infrared spectrometry. The hardness of the polymerized samples was measured by shore D method, whereas the water absorption was measured gravimetrically. Kinetics models for polymerizations using different heating modes were determined by model fitting method. The rate of the MWIH polymerization was eight times higher compared with the CIH polymerization. The CIH polymerization is found to be the phase-boundary controlled reaction for which the rate of contracting volume is the rate limiting step, whereas MWIH polymerization is found to be the first-order reaction and the monomer concentration in the polymerization mixture is the rate limiting step. The samples of PMMA base dental materials synthesized by MWIH polymerization exhibit better application properties (hardness and water absorption).
PB  - Wiley, Hoboken
T2  - Journal of Applied Polymer Science
T1  - Influence of Microwave Heating on the Polymerization Kinetics and Application Properties of the PMMA Dental Materials
EP  - 3606
IS  - 6
SP  - 3598
VL  - 119
DO  - 10.1002/app.33041
ER  - 

@article{
author = "Spasojević, Pavle and Adnađević, Borivoj and Veličković, Sava and Jovanović, Jelena",
year = "2011",
abstract = "The effects of heating mode (conventional isothermal heating (CIH) and microwave isothermal heating (MWIH) on the kinetics of polymerization and the properties important for the application (residual monomer, hardness, and water absorption) of three commercial poly(methyl methacrylate) (PMMA) base dental materials were investigated. The degree of monomer conversion was determined by infrared spectrometry. The hardness of the polymerized samples was measured by shore D method, whereas the water absorption was measured gravimetrically. Kinetics models for polymerizations using different heating modes were determined by model fitting method. The rate of the MWIH polymerization was eight times higher compared with the CIH polymerization. The CIH polymerization is found to be the phase-boundary controlled reaction for which the rate of contracting volume is the rate limiting step, whereas MWIH polymerization is found to be the first-order reaction and the monomer concentration in the polymerization mixture is the rate limiting step. The samples of PMMA base dental materials synthesized by MWIH polymerization exhibit better application properties (hardness and water absorption).",
publisher = "Wiley, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "Influence of Microwave Heating on the Polymerization Kinetics and Application Properties of the PMMA Dental Materials",
pages = "3606-3598",
number = "6",
volume = "119",
doi = "10.1002/app.33041"
}

Spasojević, P., Adnađević, B., Veličković, S.,& Jovanović, J.. (2011). Influence of Microwave Heating on the Polymerization Kinetics and Application Properties of the PMMA Dental Materials. in Journal of Applied Polymer Science
Wiley, Hoboken., 119(6), 3598-3606.
https://doi.org/10.1002/app.33041

Spasojević P, Adnađević B, Veličković S, Jovanović J. Influence of Microwave Heating on the Polymerization Kinetics and Application Properties of the PMMA Dental Materials. in Journal of Applied Polymer Science. 2011;119(6):3598-3606.
doi:10.1002/app.33041 .

Spasojević, Pavle, Adnađević, Borivoj, Veličković, Sava, Jovanović, Jelena, "Influence of Microwave Heating on the Polymerization Kinetics and Application Properties of the PMMA Dental Materials" in Journal of Applied Polymer Science, 119, no. 6 (2011):3598-3606,
https://doi.org/10.1002/app.33041 . .

TY  - JOUR
AU  - Pavelkić, V.M.
AU  - Beljanski, M.V.
AU  - Antić, K.M.
AU  - Babić, Marija M.
AU  - Brdarić, T.P.
AU  - Gopčević, K.R.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6027
AB  - Differential scanning calorimetry (DCS) has been used to determine thermodynamic profile of pepsin and the in vitro effect of Al(III) ions. Thermograms of pepsin unfolding in the presence and absence of aluminum were used to determine the binding constant, KL, in the pepsin–aluminium model system. The thermodynamic parameters were derived from DSC profiles at different ligand concentrations (1, 5 and 10 mM). The temperatures of thermal transitions (Tm), calorimetric (ΔHcal) and van’t Hoff enthalpy (ΔHVH), Gibbs free energy, Δ(ΔG), of Al(III) binding to pepsin, as well as an average number of ligands bound to the native protein, were obtained from DSC profiles too. Temperature-dependent changes in the protein structure were also monitored by native PAGE electrophoresis. Increasing the temperature causes the decrease in electrophoretic mobility. Increase in concentration of Al(III) decelerate the migration of pepsin samples on concentration dependent manner. Analysis showed that ligand binding increases thermal stability of protein.
PB  - Pleiades Publishing
T2  - Russian Journal of Physical Chemistry A
T1  - Thermal stability of porcine pepsin influenced by Al(III) ion: DSC study
EP  - 2250
IS  - 13
SP  - 2245
VL  - 85
DO  - 10.1134/S003602441113022X
ER  - 

@article{
author = "Pavelkić, V.M. and Beljanski, M.V. and Antić, K.M. and Babić, Marija M. and Brdarić, T.P. and Gopčević, K.R.",
year = "2011",
abstract = "Differential scanning calorimetry (DCS) has been used to determine thermodynamic profile of pepsin and the in vitro effect of Al(III) ions. Thermograms of pepsin unfolding in the presence and absence of aluminum were used to determine the binding constant, KL, in the pepsin–aluminium model system. The thermodynamic parameters were derived from DSC profiles at different ligand concentrations (1, 5 and 10 mM). The temperatures of thermal transitions (Tm), calorimetric (ΔHcal) and van’t Hoff enthalpy (ΔHVH), Gibbs free energy, Δ(ΔG), of Al(III) binding to pepsin, as well as an average number of ligands bound to the native protein, were obtained from DSC profiles too. Temperature-dependent changes in the protein structure were also monitored by native PAGE electrophoresis. Increasing the temperature causes the decrease in electrophoretic mobility. Increase in concentration of Al(III) decelerate the migration of pepsin samples on concentration dependent manner. Analysis showed that ligand binding increases thermal stability of protein.",
publisher = "Pleiades Publishing",
journal = "Russian Journal of Physical Chemistry A",
title = "Thermal stability of porcine pepsin influenced by Al(III) ion: DSC study",
pages = "2250-2245",
number = "13",
volume = "85",
doi = "10.1134/S003602441113022X"
}

Pavelkić, V.M., Beljanski, M.V., Antić, K.M., Babić, M. M., Brdarić, T.P.,& Gopčević, K.R.. (2011). Thermal stability of porcine pepsin influenced by Al(III) ion: DSC study. in Russian Journal of Physical Chemistry A
Pleiades Publishing., 85(13), 2245-2250.
https://doi.org/10.1134/S003602441113022X

Pavelkić V, Beljanski M, Antić K, Babić MM, Brdarić T, Gopčević K. Thermal stability of porcine pepsin influenced by Al(III) ion: DSC study. in Russian Journal of Physical Chemistry A. 2011;85(13):2245-2250.
doi:10.1134/S003602441113022X .

Pavelkić, V.M., Beljanski, M.V., Antić, K.M., Babić, Marija M., Brdarić, T.P., Gopčević, K.R., "Thermal stability of porcine pepsin influenced by Al(III) ion: DSC study" in Russian Journal of Physical Chemistry A, 85, no. 13 (2011):2245-2250,
https://doi.org/10.1134/S003602441113022X . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Adnađević, Borivoj
AU  - Veličković, Sava
AU  - Jovanović, Jelena
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1688
AB  - Poly(methacrylic acid) hydrogels were synthesized. The effects of the synthesis parameters: the neutralization degree of methacrylic acid and the concentrations of monomer, crosslinker and initiator on the xerogels structural properties: the xerogel density (rho(xg)), the number average molar mass between the network crosslinks (M-c), the crosslink degree (rho
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels
EP  - 214
IS  - 1
SP  - 206
VL  - 156
DO  - 10.1016/j.cej.2009.10.040
ER  - 

@article{
author = "Panić, Vesna and Adnađević, Borivoj and Veličković, Sava and Jovanović, Jelena",
year = "2010",
abstract = "Poly(methacrylic acid) hydrogels were synthesized. The effects of the synthesis parameters: the neutralization degree of methacrylic acid and the concentrations of monomer, crosslinker and initiator on the xerogels structural properties: the xerogel density (rho(xg)), the number average molar mass between the network crosslinks (M-c), the crosslink degree (rho",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels",
pages = "214-206",
number = "1",
volume = "156",
doi = "10.1016/j.cej.2009.10.040"
}

Panić, V., Adnađević, B., Veličković, S.,& Jovanović, J.. (2010). The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 156(1), 206-214.
https://doi.org/10.1016/j.cej.2009.10.040

Panić V, Adnađević B, Veličković S, Jovanović J. The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels. in Chemical Engineering Journal. 2010;156(1):206-214.
doi:10.1016/j.cej.2009.10.040 .

Panić, Vesna, Adnađević, Borivoj, Veličković, Sava, Jovanović, Jelena, "The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels" in Chemical Engineering Journal, 156, no. 1 (2010):206-214,
https://doi.org/10.1016/j.cej.2009.10.040 . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Jovanović, J.
AU  - Adnađević, Borivoj
AU  - Veličković, Jovan S.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1441
AB  - Hydrogels based on crosslinked polymethacrylic acid were synthesized via free-radical polymerization in aqueous solution, using N,N'-methylene bisacrylamide as a crosslinking agent and 2,2'-azobis-[2-(2-imidazolin-2-yl)propane] dihydrochloride as an initiator. The influence of the reaction parameters (the neutralization degree of methacrylic acid and the initial monomer concentration) on the equilibrium swelling degree, the swelling kinetic parameters and the basic structural properties of xerogels was investigated. The change of synthesis parameters leads to the change of the basic structural parameters of xerogel, as well as the equilibrium swelling degree and the initial swelling rate of the hydrogels. It is found that there are power form relationships between the equilibrium swelling degree, the initial swelling rate and the structural xerogel's properties and the change of the neutralization degree of monomer, i.e. the monomer concentration. The examined correlations proved that the crosslinking density is the crucial parameter which determines all the other investigated structural and swelling parameters.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Russian Journal of Physical Chemistry A
T1  - Effect of synthesis parameters on polymethacrylic acid xerogel structures and equilibrium swelling
EP  - 1562
IS  - 9
SP  - 1558
VL  - 83
DO  - 10.1134/S003602440909026X
ER  - 

@article{
author = "Panić, Vesna and Jovanović, J. and Adnađević, Borivoj and Veličković, Jovan S.",
year = "2009",
abstract = "Hydrogels based on crosslinked polymethacrylic acid were synthesized via free-radical polymerization in aqueous solution, using N,N'-methylene bisacrylamide as a crosslinking agent and 2,2'-azobis-[2-(2-imidazolin-2-yl)propane] dihydrochloride as an initiator. The influence of the reaction parameters (the neutralization degree of methacrylic acid and the initial monomer concentration) on the equilibrium swelling degree, the swelling kinetic parameters and the basic structural properties of xerogels was investigated. The change of synthesis parameters leads to the change of the basic structural parameters of xerogel, as well as the equilibrium swelling degree and the initial swelling rate of the hydrogels. It is found that there are power form relationships between the equilibrium swelling degree, the initial swelling rate and the structural xerogel's properties and the change of the neutralization degree of monomer, i.e. the monomer concentration. The examined correlations proved that the crosslinking density is the crucial parameter which determines all the other investigated structural and swelling parameters.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Effect of synthesis parameters on polymethacrylic acid xerogel structures and equilibrium swelling",
pages = "1562-1558",
number = "9",
volume = "83",
doi = "10.1134/S003602440909026X"
}

Panić, V., Jovanović, J., Adnađević, B.,& Veličković, J. S.. (2009). Effect of synthesis parameters on polymethacrylic acid xerogel structures and equilibrium swelling. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 83(9), 1558-1562.
https://doi.org/10.1134/S003602440909026X

Panić V, Jovanović J, Adnađević B, Veličković JS. Effect of synthesis parameters on polymethacrylic acid xerogel structures and equilibrium swelling. in Russian Journal of Physical Chemistry A. 2009;83(9):1558-1562.
doi:10.1134/S003602440909026X .

Panić, Vesna, Jovanović, J., Adnađević, Borivoj, Veličković, Jovan S., "Effect of synthesis parameters on polymethacrylic acid xerogel structures and equilibrium swelling" in Russian Journal of Physical Chemistry A, 83, no. 9 (2009):1558-1562,
https://doi.org/10.1134/S003602440909026X . .