Thermal and mechanical behavior evaluation of dental composites filled with irradiated montmorillonite
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2017
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Journal of Applied Polymer Science
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The effects of pre-irradiation treatment (dose ranged from 25 to 50 kGy) of MMT (Montmorillonite) nanoclay added as
filler (50 wt %) in experimental dental composites was studied; composites containing similar amounts of non-irradiated MMT were
also tested. The thermal stability of the resulting material was tested by thermogravimetric analysis ranging from 50 to 800 8C. Elastic
modulus and flexural strength were determined by the three point bending test (n510). Data for elastic modulus was analyzed using
two way ANOVA/Tukey’s test. Data for flexural strength was analyzed using Kruskal–Wallis/Tukey’s test. For all tests, the global significance
level was 5%. The modifications in elastic modulus and flexural strength with applied dose were characterized. X-ray diffraction
analysis allows the depicting of intercalation phenomenon between base-polymer and nanophase. The polymeric system
modified with MMT nanoparticles showed higher thermal stability by delaying the thermal degradation, compared to the control
group, and the radiation dose influenced this thermal behavior directly. However, the applied dose was not sufficient to improve the
mechanical properties significantly, which is related to the interaction between MMT and polymeric matrix. The pre-irradiation treatment
of MMT nanoclay phase was useful for attaining efficient interaction between the two constitutive phases of the polymeric systems
based bis-GMA/TEGDMA [bisphenol A bis(2-hydroxy-3-methacryloxypropyl)ether/triethyleneglycol dimethacrylate], modified
with MMT nanoparticles, because the polymer component was not affected.
Como referenciar
CAMPOS, L.M.P.; ZAHARESCU, T.; BOARO, L.C.; SANTOS, L.K.G.; SANTOS, T.M.R.; FERREIRA, H.P.; PARRA, D.F. Thermal and mechanical behavior evaluation of dental composites filled with irradiated montmorillonite. Journal of Applied Polymer Science, v. 134, n. 29, p. 45063-1 - 45063-6, 2017. DOI: 10.1002/app.45063. Disponível em: http://repositorio.ipen.br/handle/123456789/27733. Acesso em: 10 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.