Polímeros: Ciência e Tecnologia
http://revistapolimeros.org.br/doi/10.1590/0104-1428.2249
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Nanopartículas de sílica silanizada como compatibilizante em compósitos de fibras de sisal/polietileno

Silanized silica nanoparticles as compatibilizer of sisal fibers/polyethylene composites

Fernandes, Janaina Rodriguesx; Moisés, Murilo Pereirax; Girotto, Emerson Marcelo; Favaro, Silvia Lucianax; Radovanovic, Eduardo

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Resumo

Foi discutida neste estudo a influência de nanopartículas de sílica na compatibilidade entre fibras de sisal e polietileno de alta densidade, utilizados na preparação de compósitos. As fibras de sisal foram tratadas quimicamente e recobertas com nanopartículas de sílica por moagem mecânica. Os compósitos foram preparados por extrusão do polietileno com diferentes quantidades de fibras. Utilizou-se diferentes técnicas de caracterização para se obter as propriedades térmicas e a morfologia das fibras de sisal e dos compósitos, a influência das fibras de sisal e da sílica na cristalinidade do polietileno e o comportamento mecânico e a absorção de água do polietileno e dos compósitos. Foi observado que a as propriedades térmicas do polietileno não são afetadas pela presença das fibras e nanopartículas. Os diferentes tratamentos químicos e a presença de sílica nas fibras de sisal resultaram em propriedades mecânicas melhoradas e foram preponderantes para a diminuição da absorção de água nos compósitos, comparados ao polietileno.

Palavras-chave

compósitos, compatibilização, nanopartícula de sílica silanizada, fibras de sisal, propriedades mecânicas.

Abstract

In this study, the influence of silanized silica nanoparticles on the compatibility of composites prepared with sisal fibers and high density polyethylene is discussed. The sisal fibers were chemically treated and covered with silica nanoparticles by mechanical milling. The composites were prepared by extrusion of HDPE and different amount of fibers. The morphology and thermal properties of the sisal fibers and composites, the influence of sisal fibers and silica nanoparticles on crystallinity of HDPE, the mechanical behavior and water uptake of composites were evaluated by different techniques. It was observed that thermal properties of HDPE on composites were not changed by the presence of sisal fibers and silica nanoparticles. The different chemical treatments in sisal fibers and the presence of silica nanoparticles resulted in improved mechanical properties and were preponderant to the water uptake decrease in the composites, comparing with HDPE.

Keywords

composites, compatibilization, silanized silica nanoparticle, sisal fibers, mechanical properties.

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