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Papers by Marija Vuksanovic
Tehnika, 2024
Polimerne smole na bazi akrilata dobijene iz Bis-GMA (Bisfenol A glicidmetakrilat), koji je pogod... more Polimerne smole na bazi akrilata dobijene iz Bis-GMA (Bisfenol A glicidmetakrilat), koji je pogodan za fotopolimerizaciju, koriste se u stomatologiji za različite namene zbog lakoće nanošenja i mogućnosti da se utiče na njihova svojstva dodavanjem ojačanja različitog oblika i hemijskog sastava. Sintetisano je ojačanje u formi čestica na bazi dvostrukih slojevitih hidroksida magnezijuma i aluminijuma (MgAl-LDH-Layered Double Hidroxides) nataloženih na silicijum dioksidu dobijenom iz ljuski pirinča. Kao podloge korišćene su metalna legura na bazi hroma i molibdena za primenu u stomatologiji i staklo u formi podloga za mikroskopske preparate. Adhezivna svojstva kompozita su bitna sa aspekta njihove primene. Adhezivna svojstva materijala su određena na osnovu merenja mikrotvrdoće kompozita i to primenom različitih opterećenja kako bi se procenio parametar adhezije koji pokazuje uticaj prevlake na podlogu. Upoređeno je kako se vezuje čista matrica od fotopolimerizujućeg akrilata sa podlogom od stomatološke legure sa vezivanjem za staklenu podlogu. Potom je upoređeno kako se vezuju kompozitni materijali na obe podloge. Adhezija je određena i na osnovu promene ugla kvašenja između kompozita i rezultati su upoređeni sa rezultatima mikroindentacije. Pokazalo se da dodatak kompozitnih čestica kao ojačanja u matricu od akrilata povećava adhezivna svojstva kompozita u odnosu na čistu matricu i da se ostvaruje bolja adhezija između kompozita i metalne podloge nego između kompozita i staklene podloge.
Tehnika, Dec 31, 2022
Predmet ovog istraživanja je postupak proizvodnje regranulata polivinil hlorida (PVC) korišćenjem... more Predmet ovog istraživanja je postupak proizvodnje regranulata polivinil hlorida (PVC) korišćenjem plastifikatora sintetisanog iz recikliranog poli(etilen tereftalata) (PET). Na ovaj način je sintetisan plastifikator koji ne predstavlja rizik po zdravlje ljudi i životnu sredinu u skladu sa prinicima hemijskog lizinga i zelene hemije. Dobijeni plastifikator je okarakterisan primenom elementalne analize, FTIR, i NMR spektroskopije i određivanjem hidroksilnog i kiselinskog broja. Ispitivana su mehanička svojstva materijala dobijenih na bazi recikliranog PVC i plastifikatora iz PET-a prema standardnim metodama. Ključne reči: plastifikator, PVC regranulat, polietilen tereftalat (PET), mehanička svojstva 1. UVOD Čovečanstvo se sve više suočava sa brojnim izazovima koji ugrožavaju sa jedne strane кvalitet života Adresa autora: Marija Vuksanović, Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča", Laboratorija za hemijsku dinamiku i permanentno obrazovanje,
Ceramics International, May 1, 2018
Journal of Industrial and Engineering Chemistry
Wear
Abstract Morphology and development of surface damage of alumina-based materials, resulting from ... more Abstract Morphology and development of surface damage of alumina-based materials, resulting from cavitation erosion is studied in this paper. Two series of samples were prepared: samples without fibers and those with the addition of 2 wt. % of ceramic fibers. The form of surface damage is considered to be the information carrier for the analysis of the resistance of materials to cavitation and the quality of this information is determined. The surface of the samples was monitored in defined time intervals in order to prepare the digitized image suitable for further analysis using image analysis software. The principal component analysis was applied to examine the appearance of certain morphological characteristics depending on the behavior of the material during cavitation erosion. It was concluded that the addition of ceramic fibers gained in importance after a long time of cavitation erosion, while during a starting period of time the difference in the morphology of the damage is not very observable.
Naziv tehničkog rešenja: Nova metoda za sintezu keramičkih materijala i nedestruktivnu karakteriz... more Naziv tehničkog rešenja: Nova metoda za sintezu keramičkih materijala i nedestruktivnu karakterizaciju površinskih oštećenja usled izlaganja kavitaciji Novo tehničko rešenje (metoda) primenjeno na nacionalnom nivou Ključne reči: Vatrostalni keramički materijali, Kavitacija, Analiza slike, Prepoznavanje oblika Za koga je rešenje rađeno: MALBEX WBI DOO, Beograd, Srbija Godina kada je rešenje kompletirano: 2019. Godina kada je rešenje počelo da se primenjuje i od koga:
Polymer Composites, 2020
As a renewable resource, starch is considered to be fully biodegradable and nonpolluting to the e... more As a renewable resource, starch is considered to be fully biodegradable and nonpolluting to the environment but the hygroscopicity of starch is the main disadvantage for wider applicability in the production of a polymer‐based material. Hydrophobically modified starch prepared using natural‐based plasticizers/modifiers in a first step ([−]‐diisopropyl D‐tartrate [DiPT], ricinoleic acid [RA] and epoxidized soybean oil [ESO]), and maleated polypropylene (MAPP) in a second step contributed to better compatibility, and thus reinforcing of composites. Tailored processing conditions, structural/morphological properties, hydrophobicity, and water‐resistance of the modified starch were established. In addition, the Charpy impact and tensile strength of composites, based on poly(ethylene‐co‐acrylic acid) (EAA) and modified starches, were determined. Increased tensile strength and Young modulus of the composite using starch‐modified with DiPT‐MAPP, that is, 3 and 83%, respectively, indicated ...
Polymers and Polymer Composites, 2021
In this study poly (vinyl butyral)/silica (PVB/SiO2) composite films were subjected to the cavita... more In this study poly (vinyl butyral)/silica (PVB/SiO2) composite films were subjected to the cavitation process. The experiments were carried out with a 10 wt.% PVB solution in ethanol. Silica nanoparticles were added into the solution in different concentration of 1, 3 and 5 wt.% SiO2 in regard to PVB. Composite films were cast from these solutions and subjected to ultrasonic cavitation. Optical images of their surfaces were analyzed before and after cavitation, by Image-Pro Plus software. The results revealed that the PVB film with 5 wt.% SiO2 nanoparticles demonstrated the greatest improvement in microhardness with the best cavitation resistance compared to other films.
Compatibilization of Polymer Blends, 2020
Abstract Polymer blends are mostly immiscible at a molecular level due to their large molecular m... more Abstract Polymer blends are mostly immiscible at a molecular level due to their large molecular mass. Therefore, the study of the way how two polymers are mixed together is of great interest. The properties of the polymer blend are very much influenced by the structure obtained during the processing of their combination, and the way to study this structure is of key importance in materials science. The aim of materials science is to correlate structural parameters to the processing and properties of a material and those studies are confirmed to be very important in the design of this class of materials. The microscopic techniques are the way to observe the structural parameters of polymer blends and to obtain data that can be used in further analysis. The ways to observe the structure of the blend and the way to treat some representative polymer blend structures are presented in the chapter.
Polymer Composites, 2020
Cavitation erosion of hybrid acrylate composite films with polyhedral oligosilsesquioxanes (POSS)... more Cavitation erosion of hybrid acrylate composite films with polyhedral oligosilsesquioxanes (POSS) was investigated in this study. The hybrid films are made with 1, 3 and 5 wt% of POSS reagents containing: (a) hydroxyl (POSS‐M), (b) both hydroxyl and allyl (POSS‐M‐A) and (c) methacryloyl groups (POSS‐M‐Cl). Addition of 5 wt% POSS‐M‐A caused the highest microhardness increase for 49.8%, in comparison to the pure matrix material. Cavitation resistance of hybrid films, estimated as the time‐dependent mass loss, was improved by POSS addition. POSS‐M‐A addition (5 wt%) contributed to 94% lower mass loss comparing to pure Bis‐GMA/TEGDMA film. Scanning electron (SEM) and atomic force microscopy (AFM) showed the lowest surface roughness obtained for composite with POSS‐M‐A. The improved hardness and wear resistance of the composite films indicated that POSS‐M‐A filler enhanced interfacial adhesion and reinforcing of the Bis‐GMA/TEGDMA matrix.
Tehnika, 2018
U radu je opisana optimizacija tehnološkog procesa dobijanja stabilne disperzije kalcijum-karbona... more U radu je opisana optimizacija tehnološkog procesa dobijanja stabilne disperzije kalcijum-karbonata (CaCO3) po standardima koje propisuje papirna industrija. Razlog korišćenja CaCO3 u proizvodnji papira je njegova niska cena u odnosu na celulozna vlakna i njegova sposobnost da poboljša svojstva konačnog proizvoda. Međutim, CaCO3 je alkalni punilac koji ima relativno lošu hemijsku stabilnost i može značajno uticati na karakteristike papira. Iz tog razloga je neophodno optimizovati tehnologiju dobijanja stabilne disperzije CaCO3 sa vrednostima srednje veličine čestica u opsegu 1 m < Dsr < 2 m, pH vrednosti 9,7 i viskoziteta η300 mPas. Sintetisani su dispergatori iz otpadnog poli(etilentereftalata) (PET-a): diglicerintereftalata (DGTP) (dispergator-D1) i dietilenglikoltereftalata (DE-GTP) (dispegator-D2) koji su pored komercijalnognatrijum-tripolifosfata (Na-TPP-D3) korišćeni u procesu mlevenja. Stabilizacija pH vrednosti je uspostavljena sa dodatakom glicin/NaOH-pufera što je omogućilo dobijanje disperzije standardnih vrednosti veličina čestica, pH vrednosti, viskoznosti i stabilnosti.
Metallurgical and Materials Engineering, 2018
A thermoplastic pultrusion process was examined using commercial fiber roving of PET/E glass, to ... more A thermoplastic pultrusion process was examined using commercial fiber roving of PET/E glass, to determine the optimum pulling speed and optimal zonal temperatures. Finite element analysis predicted heat transfer through the commingled fibers and air in the pultrusion die. The cross-section of obtained rods was examined, and image analysis was carried out to obtain information about the degree of fiber impregnation, number of voids and uniformity of fiber distribution. Optimizing the temperature field for the pultrusion of poly (ethylene terephthalate) is of significant importance. The pulling speed has the same importance. These two parameters are closely related as evidenced by the analysis of images.
Wear, 2019
Composites are materials that reach many users and therefore, it is necessary to correlate the pr... more Composites are materials that reach many users and therefore, it is necessary to correlate the properties of every component on the behaviour of the material. Alumina is used as reinforcement with the aim of improving hardness. It was proven that the hardness depends on the crystal structure of the reinforcement. As the hardness is related to cavitation resistance, the influence of different reinforcements on the composite cavitation resistance was studied. Alumina and iron(III) oxide doped alumina particles were prepared by the sol-gel technique, starting from soluble salts of both elements. The gels were calcined at three different temperatures: 700, 800 and 900°C. Poly(methyl methacrylate), PMMA, was used as the polymer matrix reinforced with alumina particles. The reinforcement content of all the samples was 3 wt %. Cavitation erosion of the samples was measured using a standard ultrasonic vibratory setup with a stationary sample. The cavitation resistance of the samples was studied using the classical mass loss method and the surface defects resulting from cavitation were analyzed. The morphologies of the defects after 1 h of cavitation erosion were examined by field emission scanning electron microscopy (FE-SEM). The images were characterized using the image analysis procedure. The results showed that the alumina crystal structure resulting at different calcination temperatures influences the defect morphology, cavitation resistance and the hardness of the composites.
Materials Characterization, 2018
Tehnika, 2024
Polimerne smole na bazi akrilata dobijene iz Bis-GMA (Bisfenol A glicidmetakrilat), koji je pogod... more Polimerne smole na bazi akrilata dobijene iz Bis-GMA (Bisfenol A glicidmetakrilat), koji je pogodan za fotopolimerizaciju, koriste se u stomatologiji za različite namene zbog lakoće nanošenja i mogućnosti da se utiče na njihova svojstva dodavanjem ojačanja različitog oblika i hemijskog sastava. Sintetisano je ojačanje u formi čestica na bazi dvostrukih slojevitih hidroksida magnezijuma i aluminijuma (MgAl-LDH-Layered Double Hidroxides) nataloženih na silicijum dioksidu dobijenom iz ljuski pirinča. Kao podloge korišćene su metalna legura na bazi hroma i molibdena za primenu u stomatologiji i staklo u formi podloga za mikroskopske preparate. Adhezivna svojstva kompozita su bitna sa aspekta njihove primene. Adhezivna svojstva materijala su određena na osnovu merenja mikrotvrdoće kompozita i to primenom različitih opterećenja kako bi se procenio parametar adhezije koji pokazuje uticaj prevlake na podlogu. Upoređeno je kako se vezuje čista matrica od fotopolimerizujućeg akrilata sa podlogom od stomatološke legure sa vezivanjem za staklenu podlogu. Potom je upoređeno kako se vezuju kompozitni materijali na obe podloge. Adhezija je određena i na osnovu promene ugla kvašenja između kompozita i rezultati su upoređeni sa rezultatima mikroindentacije. Pokazalo se da dodatak kompozitnih čestica kao ojačanja u matricu od akrilata povećava adhezivna svojstva kompozita u odnosu na čistu matricu i da se ostvaruje bolja adhezija između kompozita i metalne podloge nego između kompozita i staklene podloge.
Tehnika, Dec 31, 2022
Predmet ovog istraživanja je postupak proizvodnje regranulata polivinil hlorida (PVC) korišćenjem... more Predmet ovog istraživanja je postupak proizvodnje regranulata polivinil hlorida (PVC) korišćenjem plastifikatora sintetisanog iz recikliranog poli(etilen tereftalata) (PET). Na ovaj način je sintetisan plastifikator koji ne predstavlja rizik po zdravlje ljudi i životnu sredinu u skladu sa prinicima hemijskog lizinga i zelene hemije. Dobijeni plastifikator je okarakterisan primenom elementalne analize, FTIR, i NMR spektroskopije i određivanjem hidroksilnog i kiselinskog broja. Ispitivana su mehanička svojstva materijala dobijenih na bazi recikliranog PVC i plastifikatora iz PET-a prema standardnim metodama. Ključne reči: plastifikator, PVC regranulat, polietilen tereftalat (PET), mehanička svojstva 1. UVOD Čovečanstvo se sve više suočava sa brojnim izazovima koji ugrožavaju sa jedne strane кvalitet života Adresa autora: Marija Vuksanović, Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča", Laboratorija za hemijsku dinamiku i permanentno obrazovanje,
Ceramics International, May 1, 2018
Journal of Industrial and Engineering Chemistry
Wear
Abstract Morphology and development of surface damage of alumina-based materials, resulting from ... more Abstract Morphology and development of surface damage of alumina-based materials, resulting from cavitation erosion is studied in this paper. Two series of samples were prepared: samples without fibers and those with the addition of 2 wt. % of ceramic fibers. The form of surface damage is considered to be the information carrier for the analysis of the resistance of materials to cavitation and the quality of this information is determined. The surface of the samples was monitored in defined time intervals in order to prepare the digitized image suitable for further analysis using image analysis software. The principal component analysis was applied to examine the appearance of certain morphological characteristics depending on the behavior of the material during cavitation erosion. It was concluded that the addition of ceramic fibers gained in importance after a long time of cavitation erosion, while during a starting period of time the difference in the morphology of the damage is not very observable.
Naziv tehničkog rešenja: Nova metoda za sintezu keramičkih materijala i nedestruktivnu karakteriz... more Naziv tehničkog rešenja: Nova metoda za sintezu keramičkih materijala i nedestruktivnu karakterizaciju površinskih oštećenja usled izlaganja kavitaciji Novo tehničko rešenje (metoda) primenjeno na nacionalnom nivou Ključne reči: Vatrostalni keramički materijali, Kavitacija, Analiza slike, Prepoznavanje oblika Za koga je rešenje rađeno: MALBEX WBI DOO, Beograd, Srbija Godina kada je rešenje kompletirano: 2019. Godina kada je rešenje počelo da se primenjuje i od koga:
Polymer Composites, 2020
As a renewable resource, starch is considered to be fully biodegradable and nonpolluting to the e... more As a renewable resource, starch is considered to be fully biodegradable and nonpolluting to the environment but the hygroscopicity of starch is the main disadvantage for wider applicability in the production of a polymer‐based material. Hydrophobically modified starch prepared using natural‐based plasticizers/modifiers in a first step ([−]‐diisopropyl D‐tartrate [DiPT], ricinoleic acid [RA] and epoxidized soybean oil [ESO]), and maleated polypropylene (MAPP) in a second step contributed to better compatibility, and thus reinforcing of composites. Tailored processing conditions, structural/morphological properties, hydrophobicity, and water‐resistance of the modified starch were established. In addition, the Charpy impact and tensile strength of composites, based on poly(ethylene‐co‐acrylic acid) (EAA) and modified starches, were determined. Increased tensile strength and Young modulus of the composite using starch‐modified with DiPT‐MAPP, that is, 3 and 83%, respectively, indicated ...
Polymers and Polymer Composites, 2021
In this study poly (vinyl butyral)/silica (PVB/SiO2) composite films were subjected to the cavita... more In this study poly (vinyl butyral)/silica (PVB/SiO2) composite films were subjected to the cavitation process. The experiments were carried out with a 10 wt.% PVB solution in ethanol. Silica nanoparticles were added into the solution in different concentration of 1, 3 and 5 wt.% SiO2 in regard to PVB. Composite films were cast from these solutions and subjected to ultrasonic cavitation. Optical images of their surfaces were analyzed before and after cavitation, by Image-Pro Plus software. The results revealed that the PVB film with 5 wt.% SiO2 nanoparticles demonstrated the greatest improvement in microhardness with the best cavitation resistance compared to other films.
Compatibilization of Polymer Blends, 2020
Abstract Polymer blends are mostly immiscible at a molecular level due to their large molecular m... more Abstract Polymer blends are mostly immiscible at a molecular level due to their large molecular mass. Therefore, the study of the way how two polymers are mixed together is of great interest. The properties of the polymer blend are very much influenced by the structure obtained during the processing of their combination, and the way to study this structure is of key importance in materials science. The aim of materials science is to correlate structural parameters to the processing and properties of a material and those studies are confirmed to be very important in the design of this class of materials. The microscopic techniques are the way to observe the structural parameters of polymer blends and to obtain data that can be used in further analysis. The ways to observe the structure of the blend and the way to treat some representative polymer blend structures are presented in the chapter.
Polymer Composites, 2020
Cavitation erosion of hybrid acrylate composite films with polyhedral oligosilsesquioxanes (POSS)... more Cavitation erosion of hybrid acrylate composite films with polyhedral oligosilsesquioxanes (POSS) was investigated in this study. The hybrid films are made with 1, 3 and 5 wt% of POSS reagents containing: (a) hydroxyl (POSS‐M), (b) both hydroxyl and allyl (POSS‐M‐A) and (c) methacryloyl groups (POSS‐M‐Cl). Addition of 5 wt% POSS‐M‐A caused the highest microhardness increase for 49.8%, in comparison to the pure matrix material. Cavitation resistance of hybrid films, estimated as the time‐dependent mass loss, was improved by POSS addition. POSS‐M‐A addition (5 wt%) contributed to 94% lower mass loss comparing to pure Bis‐GMA/TEGDMA film. Scanning electron (SEM) and atomic force microscopy (AFM) showed the lowest surface roughness obtained for composite with POSS‐M‐A. The improved hardness and wear resistance of the composite films indicated that POSS‐M‐A filler enhanced interfacial adhesion and reinforcing of the Bis‐GMA/TEGDMA matrix.
Tehnika, 2018
U radu je opisana optimizacija tehnološkog procesa dobijanja stabilne disperzije kalcijum-karbona... more U radu je opisana optimizacija tehnološkog procesa dobijanja stabilne disperzije kalcijum-karbonata (CaCO3) po standardima koje propisuje papirna industrija. Razlog korišćenja CaCO3 u proizvodnji papira je njegova niska cena u odnosu na celulozna vlakna i njegova sposobnost da poboljša svojstva konačnog proizvoda. Međutim, CaCO3 je alkalni punilac koji ima relativno lošu hemijsku stabilnost i može značajno uticati na karakteristike papira. Iz tog razloga je neophodno optimizovati tehnologiju dobijanja stabilne disperzije CaCO3 sa vrednostima srednje veličine čestica u opsegu 1 m < Dsr < 2 m, pH vrednosti 9,7 i viskoziteta η300 mPas. Sintetisani su dispergatori iz otpadnog poli(etilentereftalata) (PET-a): diglicerintereftalata (DGTP) (dispergator-D1) i dietilenglikoltereftalata (DE-GTP) (dispegator-D2) koji su pored komercijalnognatrijum-tripolifosfata (Na-TPP-D3) korišćeni u procesu mlevenja. Stabilizacija pH vrednosti je uspostavljena sa dodatakom glicin/NaOH-pufera što je omogućilo dobijanje disperzije standardnih vrednosti veličina čestica, pH vrednosti, viskoznosti i stabilnosti.
Metallurgical and Materials Engineering, 2018
A thermoplastic pultrusion process was examined using commercial fiber roving of PET/E glass, to ... more A thermoplastic pultrusion process was examined using commercial fiber roving of PET/E glass, to determine the optimum pulling speed and optimal zonal temperatures. Finite element analysis predicted heat transfer through the commingled fibers and air in the pultrusion die. The cross-section of obtained rods was examined, and image analysis was carried out to obtain information about the degree of fiber impregnation, number of voids and uniformity of fiber distribution. Optimizing the temperature field for the pultrusion of poly (ethylene terephthalate) is of significant importance. The pulling speed has the same importance. These two parameters are closely related as evidenced by the analysis of images.
Wear, 2019
Composites are materials that reach many users and therefore, it is necessary to correlate the pr... more Composites are materials that reach many users and therefore, it is necessary to correlate the properties of every component on the behaviour of the material. Alumina is used as reinforcement with the aim of improving hardness. It was proven that the hardness depends on the crystal structure of the reinforcement. As the hardness is related to cavitation resistance, the influence of different reinforcements on the composite cavitation resistance was studied. Alumina and iron(III) oxide doped alumina particles were prepared by the sol-gel technique, starting from soluble salts of both elements. The gels were calcined at three different temperatures: 700, 800 and 900°C. Poly(methyl methacrylate), PMMA, was used as the polymer matrix reinforced with alumina particles. The reinforcement content of all the samples was 3 wt %. Cavitation erosion of the samples was measured using a standard ultrasonic vibratory setup with a stationary sample. The cavitation resistance of the samples was studied using the classical mass loss method and the surface defects resulting from cavitation were analyzed. The morphologies of the defects after 1 h of cavitation erosion were examined by field emission scanning electron microscopy (FE-SEM). The images were characterized using the image analysis procedure. The results showed that the alumina crystal structure resulting at different calcination temperatures influences the defect morphology, cavitation resistance and the hardness of the composites.
Materials Characterization, 2018