TY  - JOUR
AU  - Mališić, Vanja
AU  - Gajić, Vuk
AU  - Porobić, Slavica
AU  - Patarić, Aleksandra
AU  - Putić, Slaviša
AU  - Vujčić, Ivica
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5958
AB  - Polymethyl methacrylate (PMMA) is a polymer material widely used in dental applications due to its excellent biocompatibility, stable physicochemical properties, easy manipulation, and low cost. The combination of biocompatible polymers and ceramics has great potential for the development of materials in the dental industry with improved mechanical properties. The addition of Al2O3 nanoparticles to PMMA can significantly improve its compressive and flexural strengths and wear resistance. Since this material is used in dental applications, it requires a high degree of product sterility. This can easily be achieved with gamma radiation treatment. Gamma radiation not only ensures the sterility of the product but can also affects changes in numerous material properties. The aim of this paper is to determine the influence of different doses of gamma radiation on the microbiological purity and changes in the mechanical and thermal properties of the PMMA/Al2O3 composite as well as the microstructural and color changes. It was found that the dose of radiation of 25 kGy is sufficient for complete sterilization of the product. This radiation dose improves the mechanical properties of the material and thermal stability. On the other hand, the dose of 25 kGy does not affect the morphology of the exposed sample and has small effect on the color change.
PB  - Elsevier Ltd
T2  - Radiation Physics and Chemistry
T1  - The effect of gamma irradiation on the synthesis, microbiological sterility, and improvement of properties of PMMA-Al2O3 composite used in dental prosthesis manufacturing
SP  - 110846
VL  - 207
DO  - 10.1016/j.radphyschem.2023.110846
ER  - 

@article{
author = "Mališić, Vanja and Gajić, Vuk and Porobić, Slavica and Patarić, Aleksandra and Putić, Slaviša and Vujčić, Ivica",
year = "2023",
abstract = "Polymethyl methacrylate (PMMA) is a polymer material widely used in dental applications due to its excellent biocompatibility, stable physicochemical properties, easy manipulation, and low cost. The combination of biocompatible polymers and ceramics has great potential for the development of materials in the dental industry with improved mechanical properties. The addition of Al2O3 nanoparticles to PMMA can significantly improve its compressive and flexural strengths and wear resistance. Since this material is used in dental applications, it requires a high degree of product sterility. This can easily be achieved with gamma radiation treatment. Gamma radiation not only ensures the sterility of the product but can also affects changes in numerous material properties. The aim of this paper is to determine the influence of different doses of gamma radiation on the microbiological purity and changes in the mechanical and thermal properties of the PMMA/Al2O3 composite as well as the microstructural and color changes. It was found that the dose of radiation of 25 kGy is sufficient for complete sterilization of the product. This radiation dose improves the mechanical properties of the material and thermal stability. On the other hand, the dose of 25 kGy does not affect the morphology of the exposed sample and has small effect on the color change.",
publisher = "Elsevier Ltd",
journal = "Radiation Physics and Chemistry",
title = "The effect of gamma irradiation on the synthesis, microbiological sterility, and improvement of properties of PMMA-Al2O3 composite used in dental prosthesis manufacturing",
pages = "110846",
volume = "207",
doi = "10.1016/j.radphyschem.2023.110846"
}

Mališić, V., Gajić, V., Porobić, S., Patarić, A., Putić, S.,& Vujčić, I.. (2023). The effect of gamma irradiation on the synthesis, microbiological sterility, and improvement of properties of PMMA-Al2O3 composite used in dental prosthesis manufacturing. in Radiation Physics and Chemistry
Elsevier Ltd., 207, 110846.
https://doi.org/10.1016/j.radphyschem.2023.110846

Mališić V, Gajić V, Porobić S, Patarić A, Putić S, Vujčić I. The effect of gamma irradiation on the synthesis, microbiological sterility, and improvement of properties of PMMA-Al2O3 composite used in dental prosthesis manufacturing. in Radiation Physics and Chemistry. 2023;207:110846.
doi:10.1016/j.radphyschem.2023.110846 .

Mališić, Vanja, Gajić, Vuk, Porobić, Slavica, Patarić, Aleksandra, Putić, Slaviša, Vujčić, Ivica, "The effect of gamma irradiation on the synthesis, microbiological sterility, and improvement of properties of PMMA-Al2O3 composite used in dental prosthesis manufacturing" in Radiation Physics and Chemistry, 207 (2023):110846,
https://doi.org/10.1016/j.radphyschem.2023.110846 . .

TY  - JOUR
AU  - Mališić, Vanja Z.
AU  - Pezo, Milada L.
AU  - Jelić, Aleksandra N.
AU  - Patarić, Aleksandra S.
AU  - Putić, Slaviša S.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7040
AB  - Poly(methyl methacrylate) (PMMA) has a broad spectrum of uses, especially in medical applications. The role of fine-grained alumina particles of PMMA composites was investigated in this study. The composites were based on PMMA modified with dimethyl itaconate (DMI) as a matrix and alumina particles (Al2O3) and alumina doped with iron (Al2O3-Fe) modified with 3-aminopropyl-trimethoxysilane (AM) and flax oil fatty acid methyl esters (biodiesel) as reinforcements. Three particle sizes were measured (~0.4, ~0.6 and ~1.2 μm). The highest thermal conductivity values were measured for the composite 5 wt.% Al2O3-Fe-AM. With the addition of 3 wt.% Al2O3-AM to the PMMA/DMI matrix, mechanical properties were improved (tensile strength, strain, and modulus of elasticity). An artificial neural network model based on the Broyden-Fletcher-Goldfarb-Shanno iterative algorithm was investigated for prediction of thermal conductivity and mechanical properties of the composites showing satisfactory results. This is relevant for applications for optimization of dental materials to produce dentures, which were exposed to variations in temperature during the application.
AB  - Poli (metil metakrilata) (PMMA)ima široku upotrebu, posebno u stomatologiji i medicini. Kompoziti su napravljeni od PMMA modifikovanog dimetil itakonatom (DMI) kao matrice. Kao pojačanje korišćene su čestice glinice (Al2O3) i glinice dopirane oksidom gvožđa (Al2O3-Fe)  modifikovanim  sa  3-aminopropil-trimetoksilanom  (AM)  i  metil  estrima  masnih  kiselina  lanenog  ulja  (biodizel –BD).  Prema merenjima toplotne provodljivosti, najveće vrednosti toplotne provodljivosti imao je kompozit sa česticama glinice 5  wt.%  Al2O3-Fe-AM. Dodatkom modifikovanih čestica glinice u PMMA/DMI matricu, poboljšane su mehaničke osobine (zatezna čvrstoća, deformacija i modul elastičnosti). Razvijen je model veštačke neuronske mreže zasnovan na iterativnom algoritmu predloženom u literaturi (Broiden-Fletcher-Goldfarb-Shanno), za predviđanje toplotne provodljivosti i mehaničkih svojstava kompozita na bazi akrilata  u  kombinaciji sa česticama na bazi glinice, u zavisnosti od masenog udela čestica, i dodatka oksida gvožđa i modifikatora. Pokazano je da ovi matematički modeli mogu predvideti mehanička i termička  svojstva  kompozitnih  materijala.  Ovo  je  posebno  relevantno  zapredviđanje  toplotne provodljivosti materijala koji se koriste u stomatologiji za izradu proteza i koji su izloženi temperaturnim promenama tokom primene.
PB  - Savez hemijskih inženjera Srbije
T2  - Hemijska industrija
T1  - Prediction of thermal and mechanical properties of acrylate-based composites using artificial neural network modeling
T1  - Predviđanje termičkih i mehaničkih svojstava kompozita na bazi akrilata korišćenjem modela veštačke neuronske mreže
EP  - 302
IS  - 4
SP  - 293
VL  - 77
DO  - 10.2298/HEMIND230119029M
ER  - 

@article{
author = "Mališić, Vanja Z. and Pezo, Milada L. and Jelić, Aleksandra N. and Patarić, Aleksandra S. and Putić, Slaviša S.",
year = "2023",
abstract = "Poly(methyl methacrylate) (PMMA) has a broad spectrum of uses, especially in medical applications. The role of fine-grained alumina particles of PMMA composites was investigated in this study. The composites were based on PMMA modified with dimethyl itaconate (DMI) as a matrix and alumina particles (Al2O3) and alumina doped with iron (Al2O3-Fe) modified with 3-aminopropyl-trimethoxysilane (AM) and flax oil fatty acid methyl esters (biodiesel) as reinforcements. Three particle sizes were measured (~0.4, ~0.6 and ~1.2 μm). The highest thermal conductivity values were measured for the composite 5 wt.% Al2O3-Fe-AM. With the addition of 3 wt.% Al2O3-AM to the PMMA/DMI matrix, mechanical properties were improved (tensile strength, strain, and modulus of elasticity). An artificial neural network model based on the Broyden-Fletcher-Goldfarb-Shanno iterative algorithm was investigated for prediction of thermal conductivity and mechanical properties of the composites showing satisfactory results. This is relevant for applications for optimization of dental materials to produce dentures, which were exposed to variations in temperature during the application., Poli (metil metakrilata) (PMMA)ima široku upotrebu, posebno u stomatologiji i medicini. Kompoziti su napravljeni od PMMA modifikovanog dimetil itakonatom (DMI) kao matrice. Kao pojačanje korišćene su čestice glinice (Al2O3) i glinice dopirane oksidom gvožđa (Al2O3-Fe)  modifikovanim  sa  3-aminopropil-trimetoksilanom  (AM)  i  metil  estrima  masnih  kiselina  lanenog  ulja  (biodizel –BD).  Prema merenjima toplotne provodljivosti, najveće vrednosti toplotne provodljivosti imao je kompozit sa česticama glinice 5  wt.%  Al2O3-Fe-AM. Dodatkom modifikovanih čestica glinice u PMMA/DMI matricu, poboljšane su mehaničke osobine (zatezna čvrstoća, deformacija i modul elastičnosti). Razvijen je model veštačke neuronske mreže zasnovan na iterativnom algoritmu predloženom u literaturi (Broiden-Fletcher-Goldfarb-Shanno), za predviđanje toplotne provodljivosti i mehaničkih svojstava kompozita na bazi akrilata  u  kombinaciji sa česticama na bazi glinice, u zavisnosti od masenog udela čestica, i dodatka oksida gvožđa i modifikatora. Pokazano je da ovi matematički modeli mogu predvideti mehanička i termička  svojstva  kompozitnih  materijala.  Ovo  je  posebno  relevantno  zapredviđanje  toplotne provodljivosti materijala koji se koriste u stomatologiji za izradu proteza i koji su izloženi temperaturnim promenama tokom primene.",
publisher = "Savez hemijskih inženjera Srbije",
journal = "Hemijska industrija",
title = "Prediction of thermal and mechanical properties of acrylate-based composites using artificial neural network modeling, Predviđanje termičkih i mehaničkih svojstava kompozita na bazi akrilata korišćenjem modela veštačke neuronske mreže",
pages = "302-293",
number = "4",
volume = "77",
doi = "10.2298/HEMIND230119029M"
}

Mališić, V. Z., Pezo, M. L., Jelić, A. N., Patarić, A. S.,& Putić, S. S.. (2023). Prediction of thermal and mechanical properties of acrylate-based composites using artificial neural network modeling. in Hemijska industrija
Savez hemijskih inženjera Srbije., 77(4), 293-302.
https://doi.org/10.2298/HEMIND230119029M

Mališić VZ, Pezo ML, Jelić AN, Patarić AS, Putić SS. Prediction of thermal and mechanical properties of acrylate-based composites using artificial neural network modeling. in Hemijska industrija. 2023;77(4):293-302.
doi:10.2298/HEMIND230119029M .

Mališić, Vanja Z., Pezo, Milada L., Jelić, Aleksandra N., Patarić, Aleksandra S., Putić, Slaviša S., "Prediction of thermal and mechanical properties of acrylate-based composites using artificial neural network modeling" in Hemijska industrija, 77, no. 4 (2023):293-302,
https://doi.org/10.2298/HEMIND230119029M . .

TY  - JOUR
AU  - Tasić, Ana
AU  - Mališić, Vanja
AU  - Stamenović, Marina
AU  - Drmanić, Saša
AU  - Međo, Bojan
AU  - Putić, Slaviša
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3203
AB  - The basic subject of this paper was the determination of the strain distribution in glass-polyester composite pipes subjected to internal pressure. Firstly, the test was performed on virgin pipe segments (without the influence of acidic solution) to determine the original properties of the examined composite pipes. Subsequently, the pipes were subjected to the influence of 25% acidic solution. Phosphoric and nitric acid were chosen, because of their frequent use in chemical industry, either as reactants or as products. The pipes were made by 'filament winding' method, with the angles of the glass fibers reinforcement [90°]2[±55°]4[90°]4. The tests were performed by subjecting the polymer composite pipes to internal pressure; the strain values were determined by strain gages in three directions: 0°, 90° and ± 45° with respect to the pipe axis. The tests were performed until the leakage occurred, up to the pressure value of approximately 100 bar, i.e. until the occurrence of the first cracks. Also, the micromechanical analysis on fracture surfaces was done by Scanning Electron Microscopy (SEM), which provided the knowledge about models and mechanisms of fracture due to the applied loading.
AB  - Cilj ovog rada je određivanje raspodele deformacija kod staklo-poliestar kompozitnih cevi koje su istaložene dejstvu unutrašnjeg pritiska. Prethodno su izvršena ispitivanja na netretiranim cevima u cilju određivanja originalnih svojstava. Zatim su cevi tretirane 25%-im rastvorom kiselina. Upotrebljene su fosforna i azotna kiselina zbog njihove česte upotrebe u hemijskoj industriji. Cevi su izrađene metodom namotavanja ('filament winding'), pri čemu su uglovi namotavanja staklenih vlakana [90 ]2[±55°]4[90°]4. Vrednosti deformacija usled delovanja unutrašnjeg pritiska su registrovane mernim trakama postavljenim u tri pravca: 0°, 90° i ± 45° u odnosu na osu cevi. Ispitivanja su izvođena do pojave procurivanja pri vrednosti pritiska od 100 bar, tj. do pojave prvih prslina. Prikazana je i mikromehanička analiza izvedena na prelomnim površinama pomoću skenirajućeg elektronskog mikroskopa (SEM) čime su dobijena saznanja o modelima i mehanizmima loma usled dejstva primenjenog opterećenja.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Influence of acidic solutions on the strain distribution in glasspolyester composite pipes subjected to internal pressure
T1  - Uticaj rastvora kiselina na raspodelu deformacija kod staklo-poliestar kompozitnih cevi istaloženih dejstvu unutrašnjeg pritiska
EP  - 118
IS  - 1
SP  - 110
VL  - 57
DO  - 10.5937/ZasMat1601110T
ER  - 

@article{
author = "Tasić, Ana and Mališić, Vanja and Stamenović, Marina and Drmanić, Saša and Međo, Bojan and Putić, Slaviša",
year = "2016",
abstract = "The basic subject of this paper was the determination of the strain distribution in glass-polyester composite pipes subjected to internal pressure. Firstly, the test was performed on virgin pipe segments (without the influence of acidic solution) to determine the original properties of the examined composite pipes. Subsequently, the pipes were subjected to the influence of 25% acidic solution. Phosphoric and nitric acid were chosen, because of their frequent use in chemical industry, either as reactants or as products. The pipes were made by 'filament winding' method, with the angles of the glass fibers reinforcement [90°]2[±55°]4[90°]4. The tests were performed by subjecting the polymer composite pipes to internal pressure; the strain values were determined by strain gages in three directions: 0°, 90° and ± 45° with respect to the pipe axis. The tests were performed until the leakage occurred, up to the pressure value of approximately 100 bar, i.e. until the occurrence of the first cracks. Also, the micromechanical analysis on fracture surfaces was done by Scanning Electron Microscopy (SEM), which provided the knowledge about models and mechanisms of fracture due to the applied loading., Cilj ovog rada je određivanje raspodele deformacija kod staklo-poliestar kompozitnih cevi koje su istaložene dejstvu unutrašnjeg pritiska. Prethodno su izvršena ispitivanja na netretiranim cevima u cilju određivanja originalnih svojstava. Zatim su cevi tretirane 25%-im rastvorom kiselina. Upotrebljene su fosforna i azotna kiselina zbog njihove česte upotrebe u hemijskoj industriji. Cevi su izrađene metodom namotavanja ('filament winding'), pri čemu su uglovi namotavanja staklenih vlakana [90 ]2[±55°]4[90°]4. Vrednosti deformacija usled delovanja unutrašnjeg pritiska su registrovane mernim trakama postavljenim u tri pravca: 0°, 90° i ± 45° u odnosu na osu cevi. Ispitivanja su izvođena do pojave procurivanja pri vrednosti pritiska od 100 bar, tj. do pojave prvih prslina. Prikazana je i mikromehanička analiza izvedena na prelomnim površinama pomoću skenirajućeg elektronskog mikroskopa (SEM) čime su dobijena saznanja o modelima i mehanizmima loma usled dejstva primenjenog opterećenja.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Influence of acidic solutions on the strain distribution in glasspolyester composite pipes subjected to internal pressure, Uticaj rastvora kiselina na raspodelu deformacija kod staklo-poliestar kompozitnih cevi istaloženih dejstvu unutrašnjeg pritiska",
pages = "118-110",
number = "1",
volume = "57",
doi = "10.5937/ZasMat1601110T"
}

Tasić, A., Mališić, V., Stamenović, M., Drmanić, S., Međo, B.,& Putić, S.. (2016). Influence of acidic solutions on the strain distribution in glasspolyester composite pipes subjected to internal pressure. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 57(1), 110-118.
https://doi.org/10.5937/ZasMat1601110T

Tasić A, Mališić V, Stamenović M, Drmanić S, Međo B, Putić S. Influence of acidic solutions on the strain distribution in glasspolyester composite pipes subjected to internal pressure. in Zaštita materijala. 2016;57(1):110-118.
doi:10.5937/ZasMat1601110T .

Tasić, Ana, Mališić, Vanja, Stamenović, Marina, Drmanić, Saša, Međo, Bojan, Putić, Slaviša, "Influence of acidic solutions on the strain distribution in glasspolyester composite pipes subjected to internal pressure" in Zaštita materijala, 57, no. 1 (2016):110-118,
https://doi.org/10.5937/ZasMat1601110T . .

TY  - JOUR
AU  - Mališić, Vanja
AU  - Ilić, Dragoljub
AU  - Bekrić, Dragoljub
AU  - Stamenović, Marina
AU  - Putić, Slaviša
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2951
AB  - The main objective of this study is to determine tensile properties of the glass-epoxy polymer composite material. The material is glass fiber 280 g/m², 'twill woven' with 100 cm width, type - Interglas 92125, and epoxy resin type MGS L-135, where samples are molded using hand manual method with 35% fiber weight per volume. Orientations were 0/90° i ±45°. In accordance with appropriate standards, tensile strength and modulus of elasticity were determined. Beside the analysis of the results obtained during the experiment, micro-mechanical analysis of the tensile failure appearance and development was conducted based on the observed cracked surface, which led to a confirmation of all characteristic mechanisms and cracks expected for this type of material and study. Micromechanical analysis performed on the cracked surfaces of the investigated samples, has led to a definition of a structure which is more suitable for exploitation of this material in a presence of this type of external load.
AB  - Predmet i cilj ovog rada je određivanje statičkih zateznih svojstava staklo-epoksi polimernog kompozitnog materijala. Ispitivani materijal je kompozitni materijal stakleno platno 280 g/m², 'twill tkanje' širine 100 cm, tip - Interglas 92125 i epoksi smola tip MGS L-135, a uzorci su oblikovani ručnom metodom sa 35% zapreminskog udela vlakana. Ispitivane su orijentacije 0/90° i ±45°. Određeni su zatezna čvrstoća i modul elastičnosti prema odgovarajućim standardnim ispitivanjima. Pored izvedene analize dobijenih rezultata, a na osnovu izgleda prelomnih površina uzoraka izvedena je i mikromehanička analiza nastanka i razvoja oštećenja pri zatezanju čime su potvrđeni svi mehanizmi i oštećenja karakteristični za ovakvu vrstu materijala i ispitivanja. Mikromehaničkom analizom na prelomnim površinama ispitivanih uzoraka se došlo do strukture koja je povoljnija u eksploataciji pri ovakvog tipu spoljašnog opterećenja.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Micromechanical crack analysis of glass-epoxy laminated composites subjected to tension load
T1  - Mikromehanička analiza loma laminatnog staklo-epoksi kompozitnog materijala ispitivanog na zatezanje
EP  - 428
IS  - 4
SP  - 421
VL  - 56
DO  - 10.5937/ZasMat1504421M
ER  - 

@article{
author = "Mališić, Vanja and Ilić, Dragoljub and Bekrić, Dragoljub and Stamenović, Marina and Putić, Slaviša",
year = "2015",
abstract = "The main objective of this study is to determine tensile properties of the glass-epoxy polymer composite material. The material is glass fiber 280 g/m², 'twill woven' with 100 cm width, type - Interglas 92125, and epoxy resin type MGS L-135, where samples are molded using hand manual method with 35% fiber weight per volume. Orientations were 0/90° i ±45°. In accordance with appropriate standards, tensile strength and modulus of elasticity were determined. Beside the analysis of the results obtained during the experiment, micro-mechanical analysis of the tensile failure appearance and development was conducted based on the observed cracked surface, which led to a confirmation of all characteristic mechanisms and cracks expected for this type of material and study. Micromechanical analysis performed on the cracked surfaces of the investigated samples, has led to a definition of a structure which is more suitable for exploitation of this material in a presence of this type of external load., Predmet i cilj ovog rada je određivanje statičkih zateznih svojstava staklo-epoksi polimernog kompozitnog materijala. Ispitivani materijal je kompozitni materijal stakleno platno 280 g/m², 'twill tkanje' širine 100 cm, tip - Interglas 92125 i epoksi smola tip MGS L-135, a uzorci su oblikovani ručnom metodom sa 35% zapreminskog udela vlakana. Ispitivane su orijentacije 0/90° i ±45°. Određeni su zatezna čvrstoća i modul elastičnosti prema odgovarajućim standardnim ispitivanjima. Pored izvedene analize dobijenih rezultata, a na osnovu izgleda prelomnih površina uzoraka izvedena je i mikromehanička analiza nastanka i razvoja oštećenja pri zatezanju čime su potvrđeni svi mehanizmi i oštećenja karakteristični za ovakvu vrstu materijala i ispitivanja. Mikromehaničkom analizom na prelomnim površinama ispitivanih uzoraka se došlo do strukture koja je povoljnija u eksploataciji pri ovakvog tipu spoljašnog opterećenja.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Micromechanical crack analysis of glass-epoxy laminated composites subjected to tension load, Mikromehanička analiza loma laminatnog staklo-epoksi kompozitnog materijala ispitivanog na zatezanje",
pages = "428-421",
number = "4",
volume = "56",
doi = "10.5937/ZasMat1504421M"
}

Mališić, V., Ilić, D., Bekrić, D., Stamenović, M.,& Putić, S.. (2015). Micromechanical crack analysis of glass-epoxy laminated composites subjected to tension load. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 56(4), 421-428.
https://doi.org/10.5937/ZasMat1504421M

Mališić V, Ilić D, Bekrić D, Stamenović M, Putić S. Micromechanical crack analysis of glass-epoxy laminated composites subjected to tension load. in Zaštita materijala. 2015;56(4):421-428.
doi:10.5937/ZasMat1504421M .

Mališić, Vanja, Ilić, Dragoljub, Bekrić, Dragoljub, Stamenović, Marina, Putić, Slaviša, "Micromechanical crack analysis of glass-epoxy laminated composites subjected to tension load" in Zaštita materijala, 56, no. 4 (2015):421-428,
https://doi.org/10.5937/ZasMat1504421M . .