TY  - JOUR
AU  - Fidanovski, Bojana Z.
AU  - Spasojević, Pavle
AU  - Panić, Vesna
AU  - Šeslija, Sanja I.
AU  - Spasojević, Jelena P.
AU  - Popović, Ivanka
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3977
AB  - The sustainable tomorrow for future generations lies with the present industrial development toward the proper utilization of various bio-based products. For a transition to a higher level of sustainability, it is necessary to form a new platform for advanced technology products. This paper reports the development of new fully bio-based unsaturated polyesters resins (UPRs). A series of prepolymers were synthesized by varying saturated diacids (oxalic, succinic and adipic acid), itaconic acid and 1,2-propandiol. Dimethyl itaconate was used as a reactive diluent (RD) in amounts of 30, 35 and 40 wt%. Rheological measurements showed that the obtained resins possessed viscosities (234-2226 mPa s) amenable to a variety of liquid molding techniques. The impact of composition variables-prepolymer structure and amount of RD-on the chemical, mechanical and thermal properties of the thermosets was examined by DMA, TA and tensile measurements and was discussed in detail. The tensile properties (37-52 MPa), glass transition temperature (60-97 A degrees C) and coefficient of thermal expansion (71-168 10(-6) A degrees C-1) of the cured resins were in the desired range for UPRs. This investigation showed that UPRs based on itaconic acid can be tailored during synthesis of the prepolymer to meet the needs of different property profiles.
PB  - Springer, New York
T2  - Journal of Materials Science
T1  - Synthesis and characterization of fully bio-based unsaturated polyester resins
EP  - 4644
IS  - 6
SP  - 4635
VL  - 53
DO  - 10.1007/s10853-017-1822-y
ER  - 

@article{
author = "Fidanovski, Bojana Z. and Spasojević, Pavle and Panić, Vesna and Šeslija, Sanja I. and Spasojević, Jelena P. and Popović, Ivanka",
year = "2018",
abstract = "The sustainable tomorrow for future generations lies with the present industrial development toward the proper utilization of various bio-based products. For a transition to a higher level of sustainability, it is necessary to form a new platform for advanced technology products. This paper reports the development of new fully bio-based unsaturated polyesters resins (UPRs). A series of prepolymers were synthesized by varying saturated diacids (oxalic, succinic and adipic acid), itaconic acid and 1,2-propandiol. Dimethyl itaconate was used as a reactive diluent (RD) in amounts of 30, 35 and 40 wt%. Rheological measurements showed that the obtained resins possessed viscosities (234-2226 mPa s) amenable to a variety of liquid molding techniques. The impact of composition variables-prepolymer structure and amount of RD-on the chemical, mechanical and thermal properties of the thermosets was examined by DMA, TA and tensile measurements and was discussed in detail. The tensile properties (37-52 MPa), glass transition temperature (60-97 A degrees C) and coefficient of thermal expansion (71-168 10(-6) A degrees C-1) of the cured resins were in the desired range for UPRs. This investigation showed that UPRs based on itaconic acid can be tailored during synthesis of the prepolymer to meet the needs of different property profiles.",
publisher = "Springer, New York",
journal = "Journal of Materials Science",
title = "Synthesis and characterization of fully bio-based unsaturated polyester resins",
pages = "4644-4635",
number = "6",
volume = "53",
doi = "10.1007/s10853-017-1822-y"
}

Fidanovski, B. Z., Spasojević, P., Panić, V., Šeslija, S. I., Spasojević, J. P.,& Popović, I.. (2018). Synthesis and characterization of fully bio-based unsaturated polyester resins. in Journal of Materials Science
Springer, New York., 53(6), 4635-4644.
https://doi.org/10.1007/s10853-017-1822-y

Fidanovski BZ, Spasojević P, Panić V, Šeslija SI, Spasojević JP, Popović I. Synthesis and characterization of fully bio-based unsaturated polyester resins. in Journal of Materials Science. 2018;53(6):4635-4644.
doi:10.1007/s10853-017-1822-y .

Fidanovski, Bojana Z., Spasojević, Pavle, Panić, Vesna, Šeslija, Sanja I., Spasojević, Jelena P., Popović, Ivanka, "Synthesis and characterization of fully bio-based unsaturated polyester resins" in Journal of Materials Science, 53, no. 6 (2018):4635-4644,
https://doi.org/10.1007/s10853-017-1822-y . .

TY  - JOUR
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Krstić, Jelena I.
AU  - Mitrić, Miodrag
AU  - Popović, Maja
AU  - Rakočević, Zlatko Lj.
AU  - Kalagasidis Krušić, Melina
AU  - Kačarević-Popović, Zorica M.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3718
AB  - To produce well-defined metal clusters stabilized in protective matrix, poly(N-isopropylacrylamide) (PNi-PAAm) hydrogel with different initial concentration of polymer was used as nanoreactor. The in situ synthesis of well dispersed silver nanoparticles (AgNPs) was performed by gamma irradiation. The obtained AgNPs are spherical in shape with the diameter less than 20 nm. Crystalline properties of nanoparticles such as size, texture coefficient, strain, stress, lattice parameter, d-spacing, and dislocation density have been calculated using XRD data. Results confirm that the changes of lattice parameter of crystalline AgNPs sensitively reflect their state of strain and stress depending on the formation conditions (i.e., on the concentration of PNiPAAm) and on the diameter of AgNPs. The negative lattice strain and compression stress were observed for the smaller AgNPs (lattice contraction), while for the larger AgNPs are positively strained and under tensile stress (lattice expansion). XPS spectra revealed the donor-acceptor type of interaction between carbonyl oxygen from PNiPAAm and AgNPs (positive shift of high BE component of O 1s and negative shift of Ag 3d BE). The greater dislocation density of smaller AgNPs incorporated in more concentrated PNiPAAm, resulted in more binding sites and stronger interaction with polymer.
PB  - Wiley, Hoboken
T2  - Polymer Composites
T1  - Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel
EP  - 1026
IS  - 5
SP  - 1014
VL  - 38
DO  - 10.1002/pc.23665
ER  - 

@article{
author = "Spasojević, Jelena P. and Radosavljević, Aleksandra and Krstić, Jelena I. and Mitrić, Miodrag and Popović, Maja and Rakočević, Zlatko Lj. and Kalagasidis Krušić, Melina and Kačarević-Popović, Zorica M.",
year = "2017",
abstract = "To produce well-defined metal clusters stabilized in protective matrix, poly(N-isopropylacrylamide) (PNi-PAAm) hydrogel with different initial concentration of polymer was used as nanoreactor. The in situ synthesis of well dispersed silver nanoparticles (AgNPs) was performed by gamma irradiation. The obtained AgNPs are spherical in shape with the diameter less than 20 nm. Crystalline properties of nanoparticles such as size, texture coefficient, strain, stress, lattice parameter, d-spacing, and dislocation density have been calculated using XRD data. Results confirm that the changes of lattice parameter of crystalline AgNPs sensitively reflect their state of strain and stress depending on the formation conditions (i.e., on the concentration of PNiPAAm) and on the diameter of AgNPs. The negative lattice strain and compression stress were observed for the smaller AgNPs (lattice contraction), while for the larger AgNPs are positively strained and under tensile stress (lattice expansion). XPS spectra revealed the donor-acceptor type of interaction between carbonyl oxygen from PNiPAAm and AgNPs (positive shift of high BE component of O 1s and negative shift of Ag 3d BE). The greater dislocation density of smaller AgNPs incorporated in more concentrated PNiPAAm, resulted in more binding sites and stronger interaction with polymer.",
publisher = "Wiley, Hoboken",
journal = "Polymer Composites",
title = "Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel",
pages = "1026-1014",
number = "5",
volume = "38",
doi = "10.1002/pc.23665"
}

Spasojević, J. P., Radosavljević, A., Krstić, J. I., Mitrić, M., Popović, M., Rakočević, Z. Lj., Kalagasidis Krušić, M.,& Kačarević-Popović, Z. M.. (2017). Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel. in Polymer Composites
Wiley, Hoboken., 38(5), 1014-1026.
https://doi.org/10.1002/pc.23665

Spasojević JP, Radosavljević A, Krstić JI, Mitrić M, Popović M, Rakočević ZL, Kalagasidis Krušić M, Kačarević-Popović ZM. Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel. in Polymer Composites. 2017;38(5):1014-1026.
doi:10.1002/pc.23665 .

Spasojević, Jelena P., Radosavljević, Aleksandra, Krstić, Jelena I., Mitrić, Miodrag, Popović, Maja, Rakočević, Zlatko Lj., Kalagasidis Krušić, Melina, Kačarević-Popović, Zorica M., "Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel" in Polymer Composites, 38, no. 5 (2017):1014-1026,
https://doi.org/10.1002/pc.23665 . .

TY  - JOUR
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Krstić, Jelena I.
AU  - Jovanović, Dragutin
AU  - Spasojević, Vuk D.
AU  - Kalagasidis Krušić, Melina
AU  - Kačarević-Popović, Zorica M.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3154
AB  - Thermo- and pH-sensitive Ag-P(NiPAAm/IA) hydrogel nanocomposites were prepared by in situ reduction of Ag+ ions with gamma irradiation. P(NiPAAm/IA) copolymer hydrogel matrices have been previously synthesized by radiation induced copolymerization. The copolymer composition was determined by elemental analysis of the dried gels, and was found to be close to that of the feed. The dependence of swelling properties and phase transitions on the IA comonomer content, temperature, pH values and presence of AgNPs were investigated. The hydrogels showed both thermo- and pH responses. By introducing small amounts of IA, swelling capacity increase, and the volume phase transition temperature (VPIT) of P(NiPAAm/IA) copolymers is transferred to higher values. Presence of AgNPs causes decrease of equilibrium swelling degree and VPIT, and allows of fine-tuning of these properties. Both the average values of compressive elastic modulus and Young's modulus of elasticity were decreased by addition of IA as a consequence of looser structure of the network (increase in molar mass between two neighboring crosslinks and decrease in effective crosslinking density). The introduction of AgNPs promoted not only improvement of these mechanical parameters, but an improvement of stress at failure especially in the systems with the highest content of IA. In addition, Ag-P(NiPAAm/IA) hydrogel nanocomposites showed good antibacterial potentials.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - European Polymer Journal
T1  - Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation
EP  - 185
SP  - 168
VL  - 69
DO  - 10.1016/j.eurpolymj.2015.06.008
ER  - 

@article{
author = "Spasojević, Jelena P. and Radosavljević, Aleksandra and Krstić, Jelena I. and Jovanović, Dragutin and Spasojević, Vuk D. and Kalagasidis Krušić, Melina and Kačarević-Popović, Zorica M.",
year = "2015",
abstract = "Thermo- and pH-sensitive Ag-P(NiPAAm/IA) hydrogel nanocomposites were prepared by in situ reduction of Ag+ ions with gamma irradiation. P(NiPAAm/IA) copolymer hydrogel matrices have been previously synthesized by radiation induced copolymerization. The copolymer composition was determined by elemental analysis of the dried gels, and was found to be close to that of the feed. The dependence of swelling properties and phase transitions on the IA comonomer content, temperature, pH values and presence of AgNPs were investigated. The hydrogels showed both thermo- and pH responses. By introducing small amounts of IA, swelling capacity increase, and the volume phase transition temperature (VPIT) of P(NiPAAm/IA) copolymers is transferred to higher values. Presence of AgNPs causes decrease of equilibrium swelling degree and VPIT, and allows of fine-tuning of these properties. Both the average values of compressive elastic modulus and Young's modulus of elasticity were decreased by addition of IA as a consequence of looser structure of the network (increase in molar mass between two neighboring crosslinks and decrease in effective crosslinking density). The introduction of AgNPs promoted not only improvement of these mechanical parameters, but an improvement of stress at failure especially in the systems with the highest content of IA. In addition, Ag-P(NiPAAm/IA) hydrogel nanocomposites showed good antibacterial potentials.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "European Polymer Journal",
title = "Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation",
pages = "185-168",
volume = "69",
doi = "10.1016/j.eurpolymj.2015.06.008"
}

Spasojević, J. P., Radosavljević, A., Krstić, J. I., Jovanović, D., Spasojević, V. D., Kalagasidis Krušić, M.,& Kačarević-Popović, Z. M.. (2015). Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation. in European Polymer Journal
Pergamon-Elsevier Science Ltd, Oxford., 69, 168-185.
https://doi.org/10.1016/j.eurpolymj.2015.06.008

Spasojević JP, Radosavljević A, Krstić JI, Jovanović D, Spasojević VD, Kalagasidis Krušić M, Kačarević-Popović ZM. Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation. in European Polymer Journal. 2015;69:168-185.
doi:10.1016/j.eurpolymj.2015.06.008 .

Spasojević, Jelena P., Radosavljević, Aleksandra, Krstić, Jelena I., Jovanović, Dragutin, Spasojević, Vuk D., Kalagasidis Krušić, Melina, Kačarević-Popović, Zorica M., "Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation" in European Polymer Journal, 69 (2015):168-185,
https://doi.org/10.1016/j.eurpolymj.2015.06.008 . .

TY  - JOUR
AU  - Krstić, Jelena I.
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Perić-Grujić, Aleksandra
AU  - Durić, Momčilo
AU  - Kačarević-Popović, Zorica M.
AU  - Popović, Srđan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2773
AB  - A nanosilver (nano-Ag)/poly(vinyl alcohol) (PVA) hydrogel device was synthesized with irradiation because it is a highly suitable tool for enhanced nano-Ag technologies and biocompatible controlled release formulations. The amount of the Ag+ ions released in vitro by the nano-Ag/PVA hydrogel device was in the antimicrobial parts per million concentration range. The modeling of the Ag+ ion release kinetics with the elements of the drug-delivery paradigm revealed the best fit solution (R-2 gt 0.99) for the Kopcha and Makoid-Banakar's pharmacokinetic dissolution models. The term A/B, derived from the Kopcha model, indicated that the nano-Ag/PVA hydrogel was mainly an Ag+-ion diffusion-controlled device. Makoid-Banakar's parameter and the short time approximated Ag+-ion diffusion constant reflected the importance of the size of the Ag nanoparticles. However, it appeared that the cell oxidation potential of the Ag nanoparticles depended on the diffusion characteristics of the fluid penetrating into the Ag/PVA nanosystem.
PB  - Wiley, Hoboken
T2  - Journal of Applied Polymer Science
T1  - In Vitro Silver Ion Release Kinetics from Nanosilver/Poly(vinyl alcohol) Hydrogels Synthesized by Gamma Irradiation
IS  - 11
VL  - 131
DO  - 10.1002/app.40321
ER  - 

@article{
author = "Krstić, Jelena I. and Spasojević, Jelena P. and Radosavljević, Aleksandra and Perić-Grujić, Aleksandra and Durić, Momčilo and Kačarević-Popović, Zorica M. and Popović, Srđan",
year = "2014",
abstract = "A nanosilver (nano-Ag)/poly(vinyl alcohol) (PVA) hydrogel device was synthesized with irradiation because it is a highly suitable tool for enhanced nano-Ag technologies and biocompatible controlled release formulations. The amount of the Ag+ ions released in vitro by the nano-Ag/PVA hydrogel device was in the antimicrobial parts per million concentration range. The modeling of the Ag+ ion release kinetics with the elements of the drug-delivery paradigm revealed the best fit solution (R-2 gt 0.99) for the Kopcha and Makoid-Banakar's pharmacokinetic dissolution models. The term A/B, derived from the Kopcha model, indicated that the nano-Ag/PVA hydrogel was mainly an Ag+-ion diffusion-controlled device. Makoid-Banakar's parameter and the short time approximated Ag+-ion diffusion constant reflected the importance of the size of the Ag nanoparticles. However, it appeared that the cell oxidation potential of the Ag nanoparticles depended on the diffusion characteristics of the fluid penetrating into the Ag/PVA nanosystem.",
publisher = "Wiley, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "In Vitro Silver Ion Release Kinetics from Nanosilver/Poly(vinyl alcohol) Hydrogels Synthesized by Gamma Irradiation",
number = "11",
volume = "131",
doi = "10.1002/app.40321"
}

Krstić, J. I., Spasojević, J. P., Radosavljević, A., Perić-Grujić, A., Durić, M., Kačarević-Popović, Z. M.,& Popović, S.. (2014). In Vitro Silver Ion Release Kinetics from Nanosilver/Poly(vinyl alcohol) Hydrogels Synthesized by Gamma Irradiation. in Journal of Applied Polymer Science
Wiley, Hoboken., 131(11).
https://doi.org/10.1002/app.40321

Krstić JI, Spasojević JP, Radosavljević A, Perić-Grujić A, Durić M, Kačarević-Popović ZM, Popović S. In Vitro Silver Ion Release Kinetics from Nanosilver/Poly(vinyl alcohol) Hydrogels Synthesized by Gamma Irradiation. in Journal of Applied Polymer Science. 2014;131(11).
doi:10.1002/app.40321 .

Krstić, Jelena I., Spasojević, Jelena P., Radosavljević, Aleksandra, Perić-Grujić, Aleksandra, Durić, Momčilo, Kačarević-Popović, Zorica M., Popović, Srđan, "In Vitro Silver Ion Release Kinetics from Nanosilver/Poly(vinyl alcohol) Hydrogels Synthesized by Gamma Irradiation" in Journal of Applied Polymer Science, 131, no. 11 (2014),
https://doi.org/10.1002/app.40321 . .