TY  - CONF
AU  - Panić, Vesna V.
AU  - Jovanović, Jelena D.
AU  - Savić, Sanja I.
AU  - Marković, Maja D.
AU  - Radulović, Aleksandra M.
AU  - Pantić, Olga
AU  - Adnađević, Borivoj K.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6887
AB  - The preparation of zeolite rich polymeric materials presents a challenge due to the zeolite settling
during synthesis, poor miscibility, the phase separation and generally insufficient interactions
between polymers and zeolites. Combination of LTA, i.e. MFI, zeolite and poly(methacrylic acid) in the
form of soft hydrogel network provided the stabilization of the zeolite particles and enabled synthesis
of composite hydrogels with very high zeolite concentrations (26-52 mass%).
The investigated morphological, mechanical and primary structural properties, water swelling ability
and thermal stability revealed high dependence on zeolite concentration and type. Zeolite particles
were uniformly dispersed in PMAA matrix as confirmed by SEM and there was no agglomeration or
zeolite leaching despite very high concentrations. FTIR spectra disclosed the existence of functional
groups of PMAA network and both zeolite types that interacted mutually and led to increased
crosslinking density. The established interactions changed the PMAA chain dynamics around the
particles, especially of the LTA type, as showed by XRD. Having much more surface groups capable to
generate interaction with PMAA, LTA zeolite stronger affected all of the investigated properties.
Composites’ mechanics was improved both in dry and swollen state compared to the PMAA hydrogel
(up to 21.8 times for the sample with the highest LTA concentration). Thermal stability of the
composites increased with increasing zeolite concentration.
The composition-property correlations were determined making this work the base for further
development of tailor-made zeolite-PMAA composite hydrogels aimed for specific application.
Composites were tested as low-cost, regenerative, environmentally friendly sorbents and showed
better removal of cationic dye compared to both components (PMAA and zeolite) alone.
PB  - Yuktan Technologies
C3  - Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain
T1  - Insight and Comparison of Property Improvement in LTA and MFI Zeolite Reinforced Poly(methacrylic acid) Highly Concentrated Composite Hydrogels
SP  - 67
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6887
ER  - 

@conference{
author = "Panić, Vesna V. and Jovanović, Jelena D. and Savić, Sanja I. and Marković, Maja D. and Radulović, Aleksandra M. and Pantić, Olga and Adnađević, Borivoj K.",
year = "2023",
abstract = "The preparation of zeolite rich polymeric materials presents a challenge due to the zeolite settling
during synthesis, poor miscibility, the phase separation and generally insufficient interactions
between polymers and zeolites. Combination of LTA, i.e. MFI, zeolite and poly(methacrylic acid) in the
form of soft hydrogel network provided the stabilization of the zeolite particles and enabled synthesis
of composite hydrogels with very high zeolite concentrations (26-52 mass%).
The investigated morphological, mechanical and primary structural properties, water swelling ability
and thermal stability revealed high dependence on zeolite concentration and type. Zeolite particles
were uniformly dispersed in PMAA matrix as confirmed by SEM and there was no agglomeration or
zeolite leaching despite very high concentrations. FTIR spectra disclosed the existence of functional
groups of PMAA network and both zeolite types that interacted mutually and led to increased
crosslinking density. The established interactions changed the PMAA chain dynamics around the
particles, especially of the LTA type, as showed by XRD. Having much more surface groups capable to
generate interaction with PMAA, LTA zeolite stronger affected all of the investigated properties.
Composites’ mechanics was improved both in dry and swollen state compared to the PMAA hydrogel
(up to 21.8 times for the sample with the highest LTA concentration). Thermal stability of the
composites increased with increasing zeolite concentration.
The composition-property correlations were determined making this work the base for further
development of tailor-made zeolite-PMAA composite hydrogels aimed for specific application.
Composites were tested as low-cost, regenerative, environmentally friendly sorbents and showed
better removal of cationic dye compared to both components (PMAA and zeolite) alone.",
publisher = "Yuktan Technologies",
journal = "Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain",
title = "Insight and Comparison of Property Improvement in LTA and MFI Zeolite Reinforced Poly(methacrylic acid) Highly Concentrated Composite Hydrogels",
pages = "67",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6887"
}

Panić, V. V., Jovanović, J. D., Savić, S. I., Marković, M. D., Radulović, A. M., Pantić, O.,& Adnađević, B. K.. (2023). Insight and Comparison of Property Improvement in LTA and MFI Zeolite Reinforced Poly(methacrylic acid) Highly Concentrated Composite Hydrogels. in Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain
Yuktan Technologies., 67.
https://hdl.handle.net/21.15107/rcub_technorep_6887

Panić VV, Jovanović JD, Savić SI, Marković MD, Radulović AM, Pantić O, Adnađević BK. Insight and Comparison of Property Improvement in LTA and MFI Zeolite Reinforced Poly(methacrylic acid) Highly Concentrated Composite Hydrogels. in Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain. 2023;:67.
https://hdl.handle.net/21.15107/rcub_technorep_6887 .

Panić, Vesna V., Jovanović, Jelena D., Savić, Sanja I., Marković, Maja D., Radulović, Aleksandra M., Pantić, Olga, Adnađević, Borivoj K., "Insight and Comparison of Property Improvement in LTA and MFI Zeolite Reinforced Poly(methacrylic acid) Highly Concentrated Composite Hydrogels" in Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain (2023):67,
https://hdl.handle.net/21.15107/rcub_technorep_6887 .

TY  - CONF
AU  - Jovanović, Jelena D.
AU  - Panić, Vesna V.
AU  - Spasojević, Pavle M.
AU  - Popović, Ivanka G.
AU  - Adnađević, Borivoj K.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6977
AB  - Composite hydrogels are the subject of intensive research due to there specific 3D cross-linked
structure with extraordinary physical and chemical properties which enables variety of applications In
spite of increasing interest for using different external fields in physical-chemical processes, three are
no available literature data about the effects of external fields on swelling and swelling kinetics of
hydrogels. Therefore, the effects of (conventional) thermal (TH), ultrasonic (US) and microwave (MW)
fields, on the swelling degree and swelling kinetics. A sample of poly(methacrylic acid) (PMAA) xerogel
with 10%wt of LTA-zeolite (PMMA-LTA) was synthesized and thoroughly characterized. The
isothermal kinetic swelling curves were determined within a temperature range T= 293-323K in the
TH, US and MW fields. The results were well fitted with the Peppas’ kinetic model. At all applied
fields, with an increase in temperature, there is an increase in the equilibrium swelling degree (SDeq)
and the swelling rate constant (k), while the parameter of Pepass's model (n) decreases. The maximum
value of SDeq and parameter n is achieved at TH, while the US assisted process leads to the maximum
value of k. The minimum value of the activation energy (Ea) and at the same time the maximum value
of the pre-exponential factor (lnA) lnA were achieved by applying the MW field. The influence of US
and MW fields on the diffusion of water molecules through the polymer network, activation of the
polymer network for swelling and relaxation of the polymer network was analysed.
PB  - Yuktan Technologies
C3  - Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain
T1  - The Effects of Different Physical Fields on Swelling Kinetics of PMAA-LTA Zeolite Composite Hydrogel Under Controlled Isothermal Conditions
SP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6977
ER  - 

@conference{
author = "Jovanović, Jelena D. and Panić, Vesna V. and Spasojević, Pavle M. and Popović, Ivanka G. and Adnađević, Borivoj K.",
year = "2023",
abstract = "Composite hydrogels are the subject of intensive research due to there specific 3D cross-linked
structure with extraordinary physical and chemical properties which enables variety of applications In
spite of increasing interest for using different external fields in physical-chemical processes, three are
no available literature data about the effects of external fields on swelling and swelling kinetics of
hydrogels. Therefore, the effects of (conventional) thermal (TH), ultrasonic (US) and microwave (MW)
fields, on the swelling degree and swelling kinetics. A sample of poly(methacrylic acid) (PMAA) xerogel
with 10%wt of LTA-zeolite (PMMA-LTA) was synthesized and thoroughly characterized. The
isothermal kinetic swelling curves were determined within a temperature range T= 293-323K in the
TH, US and MW fields. The results were well fitted with the Peppas’ kinetic model. At all applied
fields, with an increase in temperature, there is an increase in the equilibrium swelling degree (SDeq)
and the swelling rate constant (k), while the parameter of Pepass's model (n) decreases. The maximum
value of SDeq and parameter n is achieved at TH, while the US assisted process leads to the maximum
value of k. The minimum value of the activation energy (Ea) and at the same time the maximum value
of the pre-exponential factor (lnA) lnA were achieved by applying the MW field. The influence of US
and MW fields on the diffusion of water molecules through the polymer network, activation of the
polymer network for swelling and relaxation of the polymer network was analysed.",
publisher = "Yuktan Technologies",
journal = "Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain",
title = "The Effects of Different Physical Fields on Swelling Kinetics of PMAA-LTA Zeolite Composite Hydrogel Under Controlled Isothermal Conditions",
pages = "63",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6977"
}

Jovanović, J. D., Panić, V. V., Spasojević, P. M., Popović, I. G.,& Adnađević, B. K.. (2023). The Effects of Different Physical Fields on Swelling Kinetics of PMAA-LTA Zeolite Composite Hydrogel Under Controlled Isothermal Conditions. in Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain
Yuktan Technologies., 63.
https://hdl.handle.net/21.15107/rcub_technorep_6977

Jovanović JD, Panić VV, Spasojević PM, Popović IG, Adnađević BK. The Effects of Different Physical Fields on Swelling Kinetics of PMAA-LTA Zeolite Composite Hydrogel Under Controlled Isothermal Conditions. in Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain. 2023;:63.
https://hdl.handle.net/21.15107/rcub_technorep_6977 .

Jovanović, Jelena D., Panić, Vesna V., Spasojević, Pavle M., Popović, Ivanka G., Adnađević, Borivoj K., "The Effects of Different Physical Fields on Swelling Kinetics of PMAA-LTA Zeolite Composite Hydrogel Under Controlled Isothermal Conditions" in Abstract Book / 4th International Conference on Advanced Polymer Science and Engineering, 23-25 October, 2023, Valencia, Spain (2023):63,
https://hdl.handle.net/21.15107/rcub_technorep_6977 .

TY  - CONF
AU  - Jovanović, Jelena
AU  - Panić, Vesna
AU  - Adnađević, Borivoj
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6976
AB  - Hydrogels are 3D cross-linked structures that, due to their unique physical and chemical properties and
possible applications, are the subject of intensive research in recent decades. In this work, the effects of
external physical fields (ultrasonic (US) and microwave (MW)) on the isothermal swelling kinetics of
poly(methacrylic acid) hydrogel were examined. A sample of poly(methacrylic acid) (PMAA) xerogel (PMMAX) was synthesized by the process of cross-linking free radical polymerization, which is described in detail in
the paper [1]. The basic primary structural properties of PMMA-X including the equilibrium swelling degree
in distilled water (SDeq), the density of xerogel (ρxg), the average molar mass between the crosslinks of a
network (Mc), the degree of crosslinking (ρc) and the distance between the macromolecular chains (ξ), were
determined and calculated. The isothermal kinetic swelling curves were determined by the tee-bag method at
a temperature range of T= 293-323K in the presence of thermal, ultrasonic, and microwave fields. The
isothermal kinetic curves of swelling were fitted with the Peppas’ kinetic model [2]. The values of the
isothermal kinetic parameters of the Peppas model (k, n) were calculated. Based on the temperature
dependence of the parameter using the Arrhenius equation, all values of the activation energy (Ea) and the
pre-exponential factor (lnA) of the swelling process in the presence of different physical fields were calculated.
The obtained results indicate that the presence of US and MW fields leads to an increase in the values of k, n,
Ea, and compared to the corresponding values during conventional heating. The US field relatively slightly
increases the value of SDeq, while the MW field significantly reduces the value of SDeq. The values of Ea and
lnA at different physical fields are interrelated by a correlation relationship (compensation effect) which is
given by the relation: lnAf=0.326+0.406Ea, f The existence of a compensation effect [3] is an indication of the
unique mechanism of activation of the polymer network at different physical fields for swelling and of the
quantum nature of Ea. The influence of US and MW fields on the diffusion of water molecules through the
polymer network, activation of the polymer network for swelling, and relaxation of the polymer network was
analyzed.
PB  - Niš : RAD Centre
C3  - Book of abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023), 19–23.06.2023, Herceg Novi
T1  - About the influence of different external fields on the swelling kinetics of PMAA hydrogels
SP  - 143
DO  - 10.21175/rad.abstr.book.2023.25.2
ER  - 

@conference{
author = "Jovanović, Jelena and Panić, Vesna and Adnađević, Borivoj",
year = "2023",
abstract = "Hydrogels are 3D cross-linked structures that, due to their unique physical and chemical properties and
possible applications, are the subject of intensive research in recent decades. In this work, the effects of
external physical fields (ultrasonic (US) and microwave (MW)) on the isothermal swelling kinetics of
poly(methacrylic acid) hydrogel were examined. A sample of poly(methacrylic acid) (PMAA) xerogel (PMMAX) was synthesized by the process of cross-linking free radical polymerization, which is described in detail in
the paper [1]. The basic primary structural properties of PMMA-X including the equilibrium swelling degree
in distilled water (SDeq), the density of xerogel (ρxg), the average molar mass between the crosslinks of a
network (Mc), the degree of crosslinking (ρc) and the distance between the macromolecular chains (ξ), were
determined and calculated. The isothermal kinetic swelling curves were determined by the tee-bag method at
a temperature range of T= 293-323K in the presence of thermal, ultrasonic, and microwave fields. The
isothermal kinetic curves of swelling were fitted with the Peppas’ kinetic model [2]. The values of the
isothermal kinetic parameters of the Peppas model (k, n) were calculated. Based on the temperature
dependence of the parameter using the Arrhenius equation, all values of the activation energy (Ea) and the
pre-exponential factor (lnA) of the swelling process in the presence of different physical fields were calculated.
The obtained results indicate that the presence of US and MW fields leads to an increase in the values of k, n,
Ea, and compared to the corresponding values during conventional heating. The US field relatively slightly
increases the value of SDeq, while the MW field significantly reduces the value of SDeq. The values of Ea and
lnA at different physical fields are interrelated by a correlation relationship (compensation effect) which is
given by the relation: lnAf=0.326+0.406Ea, f The existence of a compensation effect [3] is an indication of the
unique mechanism of activation of the polymer network at different physical fields for swelling and of the
quantum nature of Ea. The influence of US and MW fields on the diffusion of water molecules through the
polymer network, activation of the polymer network for swelling, and relaxation of the polymer network was
analyzed.",
publisher = "Niš : RAD Centre",
journal = "Book of abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023), 19–23.06.2023, Herceg Novi",
title = "About the influence of different external fields on the swelling kinetics of PMAA hydrogels",
pages = "143",
doi = "10.21175/rad.abstr.book.2023.25.2"
}

Jovanović, J., Panić, V.,& Adnađević, B.. (2023). About the influence of different external fields on the swelling kinetics of PMAA hydrogels. in Book of abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023), 19–23.06.2023, Herceg Novi
Niš : RAD Centre., 143.
https://doi.org/10.21175/rad.abstr.book.2023.25.2

Jovanović J, Panić V, Adnađević B. About the influence of different external fields on the swelling kinetics of PMAA hydrogels. in Book of abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023), 19–23.06.2023, Herceg Novi. 2023;:143.
doi:10.21175/rad.abstr.book.2023.25.2 .

Jovanović, Jelena, Panić, Vesna, Adnađević, Borivoj, "About the influence of different external fields on the swelling kinetics of PMAA hydrogels" in Book of abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023), 19–23.06.2023, Herceg Novi (2023):143,
https://doi.org/10.21175/rad.abstr.book.2023.25.2 . .

TY  - JOUR
AU  - Stanić, Vojislav
AU  - Adnađević, Borivoj
AU  - Dimitrijević, Suzana
AU  - Dimović, Slavko
AU  - Mitrić, Miodrag
AU  - Zmejkovski, Bojana
AU  - Smiljanić, Slavko N.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3844
AB  - Fluorapatite nanopowders with different amounts of fluoride ions were prepared using the surfactant-assisted microwave method under isothermal conditions. Microwave irradiation was applied for the rapid formation of crystals. A micellar solution of polyoxyethylene (23) lauryl ether was used as a regulator of nucleation and crystal growth. Characterization studies from X-ray diffraction, field-emission scaning electron microscopy and Fourier(-)transform infrared spectra showed that crystals have an apatite structure and particles of all samples are nano size, with an average length of 50 mn and about 15-25 nm in diameter. Antimicrobial studies have demonstrated that synthesized fluorapatite nanopowders exhibit activity against tested pathogens: Eseherichia coli, Staphylococcus aureus and Candida albicans. Activity increased with the amount of fluoride ions. The synthesized fluorapatite nanomaterials are promising as materials in environmental protection and medicine for orthopedics and dental restorations.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology & Radiation Protection
T1  - Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions
EP  - 187
IS  - 2
SP  - 180
VL  - 33
DO  - 10.2298/NTRP1802180S
ER  - 

@article{
author = "Stanić, Vojislav and Adnađević, Borivoj and Dimitrijević, Suzana and Dimović, Slavko and Mitrić, Miodrag and Zmejkovski, Bojana and Smiljanić, Slavko N.",
year = "2018",
abstract = "Fluorapatite nanopowders with different amounts of fluoride ions were prepared using the surfactant-assisted microwave method under isothermal conditions. Microwave irradiation was applied for the rapid formation of crystals. A micellar solution of polyoxyethylene (23) lauryl ether was used as a regulator of nucleation and crystal growth. Characterization studies from X-ray diffraction, field-emission scaning electron microscopy and Fourier(-)transform infrared spectra showed that crystals have an apatite structure and particles of all samples are nano size, with an average length of 50 mn and about 15-25 nm in diameter. Antimicrobial studies have demonstrated that synthesized fluorapatite nanopowders exhibit activity against tested pathogens: Eseherichia coli, Staphylococcus aureus and Candida albicans. Activity increased with the amount of fluoride ions. The synthesized fluorapatite nanomaterials are promising as materials in environmental protection and medicine for orthopedics and dental restorations.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology & Radiation Protection",
title = "Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions",
pages = "187-180",
number = "2",
volume = "33",
doi = "10.2298/NTRP1802180S"
}

Stanić, V., Adnađević, B., Dimitrijević, S., Dimović, S., Mitrić, M., Zmejkovski, B.,& Smiljanić, S. N.. (2018). Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions. in Nuclear Technology & Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 33(2), 180-187.
https://doi.org/10.2298/NTRP1802180S

Stanić V, Adnađević B, Dimitrijević S, Dimović S, Mitrić M, Zmejkovski B, Smiljanić SN. Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions. in Nuclear Technology & Radiation Protection. 2018;33(2):180-187.
doi:10.2298/NTRP1802180S .

Stanić, Vojislav, Adnađević, Borivoj, Dimitrijević, Suzana, Dimović, Slavko, Mitrić, Miodrag, Zmejkovski, Bojana, Smiljanić, Slavko N., "Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions" in Nuclear Technology & Radiation Protection, 33, no. 2 (2018):180-187,
https://doi.org/10.2298/NTRP1802180S . .

TY  - JOUR
AU  - Spasojević, Pavle
AU  - Jovanović, Jelena
AU  - Adnađević, Borivoj
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2392
AB  - The effects of heating mode (conventional and microwave) on the kinetics of isothermal polymerization of MMA composite materials were investigated. Isothermal kinetics curves at temperature range from 343 K to 363 K for both conventional (CH) and microwave heating (MWH) were determined. It was found that the polymerization of MMA composite materials was kinetically elementary reaction for both CH and MWH. The kinetics of CH polymerization can be described by the model of phase-boundary controlled process (contracting volume), whereas the kinetics of MWH polymerization can be described by the model of first-order chemical reaction. The kinetics parameters (E-a and In A) of the polymerization under microwave heating are lower than for conventional heating. The established decreases in the activation energy and pre-exponential factor under the MWH compared to the CH is explained with the increase in the energy of ground vibrational level of the C-O valence vibrations (v = 987 cm(-1)) in methyl methacrylate molecule and with the decrease in its anharmonicity factor which is caused with the selective resonant transfer of energy from the energetic reservoir to the oscillators in methyl methacrylate molecules.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Unique effects of microwave heating on polymerization kinetics of poly(methyl methacrylate) composites
EP  - 890
IS  - 2-3
SP  - 882
VL  - 141
DO  - 10.1016/j.matchemphys.2013.06.019
ER  - 

@article{
author = "Spasojević, Pavle and Jovanović, Jelena and Adnađević, Borivoj",
year = "2013",
abstract = "The effects of heating mode (conventional and microwave) on the kinetics of isothermal polymerization of MMA composite materials were investigated. Isothermal kinetics curves at temperature range from 343 K to 363 K for both conventional (CH) and microwave heating (MWH) were determined. It was found that the polymerization of MMA composite materials was kinetically elementary reaction for both CH and MWH. The kinetics of CH polymerization can be described by the model of phase-boundary controlled process (contracting volume), whereas the kinetics of MWH polymerization can be described by the model of first-order chemical reaction. The kinetics parameters (E-a and In A) of the polymerization under microwave heating are lower than for conventional heating. The established decreases in the activation energy and pre-exponential factor under the MWH compared to the CH is explained with the increase in the energy of ground vibrational level of the C-O valence vibrations (v = 987 cm(-1)) in methyl methacrylate molecule and with the decrease in its anharmonicity factor which is caused with the selective resonant transfer of energy from the energetic reservoir to the oscillators in methyl methacrylate molecules.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Unique effects of microwave heating on polymerization kinetics of poly(methyl methacrylate) composites",
pages = "890-882",
number = "2-3",
volume = "141",
doi = "10.1016/j.matchemphys.2013.06.019"
}

Spasojević, P., Jovanović, J.,& Adnađević, B.. (2013). Unique effects of microwave heating on polymerization kinetics of poly(methyl methacrylate) composites. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 141(2-3), 882-890.
https://doi.org/10.1016/j.matchemphys.2013.06.019

Spasojević P, Jovanović J, Adnađević B. Unique effects of microwave heating on polymerization kinetics of poly(methyl methacrylate) composites. in Materials Chemistry and Physics. 2013;141(2-3):882-890.
doi:10.1016/j.matchemphys.2013.06.019 .

Spasojević, Pavle, Jovanović, Jelena, Adnađević, Borivoj, "Unique effects of microwave heating on polymerization kinetics of poly(methyl methacrylate) composites" in Materials Chemistry and Physics, 141, no. 2-3 (2013):882-890,
https://doi.org/10.1016/j.matchemphys.2013.06.019 . .

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  - 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 . .

TY  - JOUR
AU  - Knežević, Zorica
AU  - Mojović, Ljiljana
AU  - Adnađević, Borivoj
PY  - 1998
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/192
AB  - Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g(-1) and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed The activation energy for lipase adsorption on zeolite was 43 kJ mol(-1). The lipase immobilized an zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
PB  - Elsevier Science Inc, New York
T2  - Enzyme and Microbial Technology
T1  - Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y
EP  - 280
IS  - 4
SP  - 275
VL  - 22
DO  - 10.1016/S0141-0229(97)00187-7
ER  - 

@article{
author = "Knežević, Zorica and Mojović, Ljiljana and Adnađević, Borivoj",
year = "1998",
abstract = "Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g(-1) and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed The activation energy for lipase adsorption on zeolite was 43 kJ mol(-1). The lipase immobilized an zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.",
publisher = "Elsevier Science Inc, New York",
journal = "Enzyme and Microbial Technology",
title = "Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y",
pages = "280-275",
number = "4",
volume = "22",
doi = "10.1016/S0141-0229(97)00187-7"
}

Knežević, Z., Mojović, L.,& Adnađević, B.. (1998). Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y. in Enzyme and Microbial Technology
Elsevier Science Inc, New York., 22(4), 275-280.
https://doi.org/10.1016/S0141-0229(97)00187-7

Knežević Z, Mojović L, Adnađević B. Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y. in Enzyme and Microbial Technology. 1998;22(4):275-280.
doi:10.1016/S0141-0229(97)00187-7 .

Knežević, Zorica, Mojović, Ljiljana, Adnađević, Borivoj, "Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y" in Enzyme and Microbial Technology, 22, no. 4 (1998):275-280,
https://doi.org/10.1016/S0141-0229(97)00187-7 . .

TY  - JOUR
AU  - Knežević, Zorica
AU  - Mojović, Ljiljana
AU  - Adnađević, Borivoj
PY  - 1998
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/156
AB  - Lipase from Candida cylindracea was immobilized by adsorption on a hydrophobic zeolite type Y. The maximal amount of bound protein of 8.2 mg g(-1) and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to the zeolite were assessed using a general model of topochemical reactions. Based on the values of the parameters of the specific kinetic model, we propose that the adsorption process is controlled by surface kinetics. This was later experimentally confirmed. The activation energy for lipase adsorption on the zeolite is 43 kJ mol(-1).
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Immobilization of lipase on a hydrophobic zeolite type Y
EP  - 264
IS  - 4
SP  - 257
VL  - 63
UR  - https://hdl.handle.net/21.15107/rcub_technorep_156
ER  - 

@article{
author = "Knežević, Zorica and Mojović, Ljiljana and Adnađević, Borivoj",
year = "1998",
abstract = "Lipase from Candida cylindracea was immobilized by adsorption on a hydrophobic zeolite type Y. The maximal amount of bound protein of 8.2 mg g(-1) and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to the zeolite were assessed using a general model of topochemical reactions. Based on the values of the parameters of the specific kinetic model, we propose that the adsorption process is controlled by surface kinetics. This was later experimentally confirmed. The activation energy for lipase adsorption on the zeolite is 43 kJ mol(-1).",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Immobilization of lipase on a hydrophobic zeolite type Y",
pages = "264-257",
number = "4",
volume = "63",
url = "https://hdl.handle.net/21.15107/rcub_technorep_156"
}

Knežević, Z., Mojović, L.,& Adnađević, B.. (1998). Immobilization of lipase on a hydrophobic zeolite type Y. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 63(4), 257-264.
https://hdl.handle.net/21.15107/rcub_technorep_156

Knežević Z, Mojović L, Adnađević B. Immobilization of lipase on a hydrophobic zeolite type Y. in Journal of the Serbian Chemical Society. 1998;63(4):257-264.
https://hdl.handle.net/21.15107/rcub_technorep_156 .

Knežević, Zorica, Mojović, Ljiljana, Adnađević, Borivoj, "Immobilization of lipase on a hydrophobic zeolite type Y" in Journal of the Serbian Chemical Society, 63, no. 4 (1998):257-264,
https://hdl.handle.net/21.15107/rcub_technorep_156 .