TY  - JOUR
AU  - Taboun, Abdulrraouf
AU  - Jovanović, Marija
AU  - Petrović, Miloš
AU  - Stajčić, Ivana
AU  - Pešić, Ivan
AU  - Stojanović, Dušica B.
AU  - Radojević, Vesna
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7746
AB  - The aim of this study is to investigate the influence of cross-linking and reinforcements in gelatin on the physico-mechanical properties of obtained composites. The gelatin-based composites cross-linked with citric acid (CA) were prepared: gelatin type B (GB) and β-tricalcium phosphate (β-TCP) and novel hybrid composite GB with β-TCP and hydroxyapatite (HAp) particles, and their structure, thermal, and mechanical properties were compared with pure gelatin B samples. FTIR analysis revealed that no chemical interaction between the reinforcements and gelatin matrix was established during the processing of hybrid composites by the solution casting method, proving the particles had no influence on GB cross-linking. The morphological investigation of hybrid composites revealed that cross-linking with CA improved the dispersion of particles, which further led to an increase in mechanical performance. The microindentation test showed that the hardness value was increased by up to 449%, which shows the high potential of β-TCP and HAp particle reinforcement combined with CA as a cross-linking agent. Furthermore, the reduced modulus of elasticity was increased by up to 288%. Results of the MTT assay on L929 cells have revealed that the hybrid composite GB-TCP-HA-CA was not cytotoxic. These results showed that GB cross-linked with CA and reinforced with different calcium phosphates presents a valuable novel material with potential applications in dentistry.
T2  - Polymers
T1  - Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness
VL  - 16
IS  - 8
SP  - 1077
DO  - 10.3390/polym16081077
ER  - 

@article{
author = "Taboun, Abdulrraouf and Jovanović, Marija and Petrović, Miloš and Stajčić, Ivana and Pešić, Ivan and Stojanović, Dušica B. and Radojević, Vesna",
year = "2024",
abstract = "The aim of this study is to investigate the influence of cross-linking and reinforcements in gelatin on the physico-mechanical properties of obtained composites. The gelatin-based composites cross-linked with citric acid (CA) were prepared: gelatin type B (GB) and β-tricalcium phosphate (β-TCP) and novel hybrid composite GB with β-TCP and hydroxyapatite (HAp) particles, and their structure, thermal, and mechanical properties were compared with pure gelatin B samples. FTIR analysis revealed that no chemical interaction between the reinforcements and gelatin matrix was established during the processing of hybrid composites by the solution casting method, proving the particles had no influence on GB cross-linking. The morphological investigation of hybrid composites revealed that cross-linking with CA improved the dispersion of particles, which further led to an increase in mechanical performance. The microindentation test showed that the hardness value was increased by up to 449%, which shows the high potential of β-TCP and HAp particle reinforcement combined with CA as a cross-linking agent. Furthermore, the reduced modulus of elasticity was increased by up to 288%. Results of the MTT assay on L929 cells have revealed that the hybrid composite GB-TCP-HA-CA was not cytotoxic. These results showed that GB cross-linked with CA and reinforced with different calcium phosphates presents a valuable novel material with potential applications in dentistry.",
journal = "Polymers",
title = "Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness",
volume = "16",
number = "8",
pages = "1077",
doi = "10.3390/polym16081077"
}

Taboun, A., Jovanović, M., Petrović, M., Stajčić, I., Pešić, I., Stojanović, D. B.,& Radojević, V.. (2024). Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness. in Polymers, 16(8), 1077.
https://doi.org/10.3390/polym16081077

Taboun A, Jovanović M, Petrović M, Stajčić I, Pešić I, Stojanović DB, Radojević V. Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness. in Polymers. 2024;16(8):1077.
doi:10.3390/polym16081077 .

Taboun, Abdulrraouf, Jovanović, Marija, Petrović, Miloš, Stajčić, Ivana, Pešić, Ivan, Stojanović, Dušica B., Radojević, Vesna, "Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness" in Polymers, 16, no. 8 (2024):1077,
https://doi.org/10.3390/polym16081077 . .

TY  - JOUR
AU  - Elhmali, Houda Taher
AU  - Stajčić, Ivana
AU  - Stajčić, Aleksandar
AU  - Pešić, Ivan
AU  - Jovanović, Marija
AU  - Petrović, Miloš
AU  - Radojević, Vesna
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7427
AB  - While dental poly methyl methacrylate(PMMA) possesses distinctive qualities such as ease of fabrication, cost-effectiveness, and favorable physical and mechanical properties, these attributes alone are inadequate to impart the necessary impact strength and hardness. Consequently, pure PMMA is less suitable for dental applications. This research focused on the incorporation of Strontium titanate (SrTiO3-STO) and hybrid filler STO/Manganese oxide (MnO2) to improve impact resistance and hardness. The potential of STO in reinforcing PMMA is poorly investigated, while hybrid filler STO/MnO2 has not been presented yet. Differential scanning calorimetry is conducted in order to investigate the agglomeration influence on the PMMA glass transition temperature (Tg), as well as the leaching of residual monomer and volatile additives that could pose a threat to human health. It has been determined that agglomeration with 1 wt% loading had no influence on Tg, while the first scan revealed differences in evaporation of small molecules, in favor of composite PMMA-STO/MnO2, which showed the trapping potential of volatiles. Investigations of mechanical properties have revealed the significant influence of hybrid STO/MnO2 filler on microhardness and total absorbed impact energy, which were increased by 89.9% and 145.4%, respectively. Results presented in this study revealed the reinforcing potential of hybrid nanoparticles that could find application in other polymers as well.
PB  - MDPI
T2  - Polymers
T1  - Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior
VL  - 16
IS  - 2
SP  - 278
DO  - 10.3390/polym16020278
ER  - 

@article{
author = "Elhmali, Houda Taher and Stajčić, Ivana and Stajčić, Aleksandar and Pešić, Ivan and Jovanović, Marija and Petrović, Miloš and Radojević, Vesna",
year = "2024",
abstract = "While dental poly methyl methacrylate(PMMA) possesses distinctive qualities such as ease of fabrication, cost-effectiveness, and favorable physical and mechanical properties, these attributes alone are inadequate to impart the necessary impact strength and hardness. Consequently, pure PMMA is less suitable for dental applications. This research focused on the incorporation of Strontium titanate (SrTiO3-STO) and hybrid filler STO/Manganese oxide (MnO2) to improve impact resistance and hardness. The potential of STO in reinforcing PMMA is poorly investigated, while hybrid filler STO/MnO2 has not been presented yet. Differential scanning calorimetry is conducted in order to investigate the agglomeration influence on the PMMA glass transition temperature (Tg), as well as the leaching of residual monomer and volatile additives that could pose a threat to human health. It has been determined that agglomeration with 1 wt% loading had no influence on Tg, while the first scan revealed differences in evaporation of small molecules, in favor of composite PMMA-STO/MnO2, which showed the trapping potential of volatiles. Investigations of mechanical properties have revealed the significant influence of hybrid STO/MnO2 filler on microhardness and total absorbed impact energy, which were increased by 89.9% and 145.4%, respectively. Results presented in this study revealed the reinforcing potential of hybrid nanoparticles that could find application in other polymers as well.",
publisher = "MDPI",
journal = "Polymers",
title = "Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior",
volume = "16",
number = "2",
pages = "278",
doi = "10.3390/polym16020278"
}

Elhmali, H. T., Stajčić, I., Stajčić, A., Pešić, I., Jovanović, M., Petrović, M.,& Radojević, V.. (2024). Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior. in Polymers
MDPI., 16(2), 278.
https://doi.org/10.3390/polym16020278

Elhmali HT, Stajčić I, Stajčić A, Pešić I, Jovanović M, Petrović M, Radojević V. Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior. in Polymers. 2024;16(2):278.
doi:10.3390/polym16020278 .

Elhmali, Houda Taher, Stajčić, Ivana, Stajčić, Aleksandar, Pešić, Ivan, Jovanović, Marija, Petrović, Miloš, Radojević, Vesna, "Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior" in Polymers, 16, no. 2 (2024):278,
https://doi.org/10.3390/polym16020278 . .