Nanocompósitos de epóxi/nanopartículas de carbonato de cálcio: propriedades termomecânicas e de superfície
Ano de defesa: | 2019 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Minas Gerais
Brasil ENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA Programa de Pós-Graduação em Engenharia Química UFMG |
Programa de Pós-Graduação: |
Não Informado pela instituição
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Link de acesso: | http://hdl.handle.net/1843/30101 |
Resumo: | Continuous demand for highly efficient materials encourages innovations on nanotechnology and nanocomposites manufacturing. The addition of calcium carbonate to epoxy resin may reduce production costs and improve the polymer’s performance. Therefore, in this study, calcium carbonate nanoparticles were synthesized by mechanochemical processing and epoxy/nano CaCO3 composites were produced aiming to obtain materials with enhanced thermomechanical and surface properties with respect to the neat epoxy. Calcium carbonate nanoparticles of calcite structure and nanometric size were successfully synthesized by mechanochemical processing using low energy mill (100 rpm). The incorporation of calcium carbonate nanoparticles at concentrations of 1, 2.5, 3 and 5 wt.% to epoxy resin DGEBA resulted in thermally stable composites. Epoxy/2.5 wt.% and epoxy/3 wt.% composites displayed an increase of 12°C and 14°C in glass transition temperature (Tg), respectively. Scanning electron microscopy images of composites revealed a hierarchical structure of micrometric sized extended aggregates of nanometric calcium carbonate particles homogeneously distributed in the polymer matrix. This morphology explains the increase in hydrophobicity, as well as gains in Young’s moduli, which were greater than 59% with respect to the neat epoxy as measured by Nanoindentation. |