Evaluation of flexural modulus, flexural strength and degree of conversion in BISGMA/TEGDMA resin filled with montmorillonite nanoparticles
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2016
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Journal of Composite Materials
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This study had as its main objective to evaluate the flexural properties (strength and modulus) and degree of conversion
of a dimethacrylate resin containing different amounts of nanoparticulated clay Montomorillonite (MMT) as filler. A series
of composites containing similar amounts (in volume) of barium glass particles was also tested as control data. Eight
formulations with polymeric matrix-based BisGMA/TEGDMA (Bisphenol A Bis(2-hydroxy-3 methacryloxypropyl)Ether/
Triethyleneglycol Dimethacrylate), four added with MMTand four added with barium glass in the volume concentration
of 20, 30, 40 and 50 vol% were studied. The degree of conversion was determined using near-IR spectroscopy. Elastic
modulus and flexural strength were determined by the three-point bending test. The dispersion of MMT nanoparticles
was determined by means of X-ray diffraction and transmission electron microscopy analysis. The fillers montomorillonite
and barium glass interacted with polymer matrix-based BisGMA/TEGDMA in a distinct manner. Although the
addition of montomorillonite nanoparticles resulted in similar degree of conversion and higher elastic modulus values at
all concentrations tested, only at the 20 vol% the flexural strength was statistically higher, compared to the control
groups filled with barium glass. This could be related to the need of concentration optimization of montomorillonite for
each type of polymer matrix in order to adjust or improve mechanical properties. The addition of low concentrations
(
Como referenciar
CAMPOS, LUIZA M.P.; BOARO, LETICIA C.; SANTOS, TAMIRIS M.R.; MARQUES, PAMELA A.; ALMEIDA, SONIA R.Y.; BRAGA, ROBERTO R.; PARRA, DUCLERC F. Evaluation of flexural modulus, flexural strength and degree of conversion in BISGMA/TEGDMA resin filled with montmorillonite nanoparticles. Journal of Composite Materials, v. 29, p. 1-11, 2016. DOI: 10.1177/0021998316656925. Disponível em: http://repositorio.ipen.br/handle/123456789/26970. Acesso em: 20 Apr 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.