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Authors
Abstract(s)
Nos últimos anos, a busca por materiais que combinem alta resistência e boa flexibilidade tem impulsionado o estudo de compósitos poliméricos reforçados com materiais elastoméricos. A adequação das propriedades mecânicas desses compósitos a diversas aplicações tem resultado em sua ampla utilização na atualidade.
Nesta dissertação, foram fabricados e caracterizados compósitos com matriz bioepóxi reforçado por partículas de polissiloxano, uma borracha de silicone. A produção foi realizada em três lotes, com frações volumétricas de 1%, 5% e 10% de partículas. Adicionalmente, foram caracterizadas as propriedades mecânicas da borracha de silicone pura e da resina epóxi pura, com fins comparativos. O objetivo principal deste estudo é comparar as propriedades mecânicas dos compósitos fabricados, especificamente a tensão máxima, as deformações máximas e o módulo de elasticidade, com as da matriz epóxi pura. Por fim, as propriedades obtidas foram analisadas minuciosamente para compreender melhor o comportamento mecânico dos compósitos produzidos, sendo apresentadas propostas para futuros trabalhos de pesquisa.
Os compósitos reforçados com partículas de silicone na fração volumétrica de 1% apresentaram as melhores propriedades mecânicas, apresentando reduções mínimas na resistência mecânica e na deformação máxima, além de uma diminuição substancial no módulo de elasticidade. Os testes de tração e de flexão realizados nos compósitos indicaram uma redução significativa no módulo de elasticidade em comparação com a resina pura, observada para todas as frações volumétricas investigadas.
In recent years, the quest for materials that combine high strength and good flexibility has driven the study of polymer composites reinforced with elastomeric materials. The suitability of the mechanical properties of these composites for various applications has led to their widespread use today. In this dissertation, bio-based epoxy matrix composites reinforced with silicone rubber particles, a polysiloxane, were fabricated and characterized. The production was carried out in three batches with volumetric fractions of 1%, 5%, and 10% of particles. Additionally, the mechanical properties of the silicone rubber and neat epoxy resin were characterized for comparative purposes. The main objective of this study is to compare the mechanical properties of the fabricate composites, specifically the maximum stress, maximum strain, and modulus of elasticity, with those of the pure epoxy matrix. Finally, the obtained properties were meticulously analyzed to better understand the mechanical behavior of the produced composites, and proposals for future research were presented. The composites reinforced with silicone particles at a 1% volume fraction exhibited the best mechanical properties, showing minimal reductions in mechanical strength and maximum deformation, as well as a substantial decrease in the modulus of elasticity. The tensile and flexural tests conducted on the composites indicated a significant reduction in the modulus of elasticity compared to pure resin, observed across all volume fractions investigated.
In recent years, the quest for materials that combine high strength and good flexibility has driven the study of polymer composites reinforced with elastomeric materials. The suitability of the mechanical properties of these composites for various applications has led to their widespread use today. In this dissertation, bio-based epoxy matrix composites reinforced with silicone rubber particles, a polysiloxane, were fabricated and characterized. The production was carried out in three batches with volumetric fractions of 1%, 5%, and 10% of particles. Additionally, the mechanical properties of the silicone rubber and neat epoxy resin were characterized for comparative purposes. The main objective of this study is to compare the mechanical properties of the fabricate composites, specifically the maximum stress, maximum strain, and modulus of elasticity, with those of the pure epoxy matrix. Finally, the obtained properties were meticulously analyzed to better understand the mechanical behavior of the produced composites, and proposals for future research were presented. The composites reinforced with silicone particles at a 1% volume fraction exhibited the best mechanical properties, showing minimal reductions in mechanical strength and maximum deformation, as well as a substantial decrease in the modulus of elasticity. The tensile and flexural tests conducted on the composites indicated a significant reduction in the modulus of elasticity compared to pure resin, observed across all volume fractions investigated.
Description
Mestrado de dupla diplomação com o Centro Federal de Educação Tecnológica de Minas Gerais – CEFET
Keywords
Bioepóxi Polissiloxano Compósitos Propriedades mecânicas