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. 2024 Jan 19;16(2):278.
doi: 10.3390/polym16020278.

Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior

Houda Taher Elhmali  1 , Ivana Stajcic  2 , Aleksandar Stajcic  3 , Ivan Pesic  3 , Marija Jovanovic  1 , Milos Petrovic  1 , Vesna Radojevic  1
Affiliations

Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior

Houda Taher Elhmali et al. Polymers (Basel). .

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.

Keywords: PMMA composite; SrTiO3/MnO2; mechanical properties; nanoparticles.

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Conflict of interest statement

The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Scheme 1
Scheme 1
Advantages and applications of PMMA in dentistry.
Figure 1
Figure 1
(a) FESEM of STO/MnO2 (b) Particle size distribution.
Figure 2
Figure 2
XRD of SrTiO3/MnO2 particles.
Figure 3
Figure 3
FESEM images of (a) PMMA (2000× magnification); (b) PMMA-STO (1000× magnification); (c) PMMA-STO/MnO2 (1000× magnification); (d) PMMA-STO (2000× magnification); (e) PMMA-STO/MnO2 (2000× magnification); (f) PMMA-STO/MnO2 (5000× magnification).
Figure 4
Figure 4
FTIR spectra of PMMA and composites with enlarged region 1500–500 cm−1.
Figure 5
Figure 5
DSC analysis of PMMA and composites: (a) second scan; (b) first scan.
Figure 6
Figure 6
Load-time curves obtained from controlled energy impact test.
See this image and copyright information in PMC

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