Compósitos de policloreto de vinila e cortiça: avaliação das propriedades térmicas, inflamabilidade e morfologia
Polyvinyl chloride and cork composites: evaluation of thermal, flammability and morphology
Pedro José Gomes Rodrigues, Lucas Rafael Carneiro da Silva, Arquimedes Lopes Nunes Filho, Renata Barbosa, Joyce Batista Azevedo, Tatianny Soares Alves
Resumo
Os compósitos de cloreto de polivinil (PVC) e cargas vegetais têm sido amplamente utilizados em diferentes áreas em função da baixa densidade, melhores propriedades mecânicas e estabilidade dimensional. O presente trabalho teve como objetivo desenvolver compósitos de PVC/Cortiça com diferentes aspectos granulométricos e percentuais de 5 e 10%. Os compósitos foram processados em uma extrusora monorosca, moldados por compressão em uma prensa hidráulica e avaliados quanto ao comportamento térmico por termogravimetria e teste de inflamabilidade vertical, e morfologia via microscopia óptica e eletrônica de varredura. Os resultados indicaram que, independentemente do conteúdo e tamanho dos grãos da cortiça, a estabilidade térmica dos compósitos não foi significativamente alterada. Quanto à inflamabilidade, todos os compósitos foram classificados como V-0, com tempo de extinção de chama menor que a matriz pura, com destaque para a composição com 10% de cortiça. Morfologicamente os compósitos apresentaram formação de aglomerados, poros e baixa adesão.
Palavras-chave
Abstract
Composites of polyvinyl chloride (PVC) and vegetable fillers have been widely used in different areas due to their low density, better mechanical properties and dimensional stability. The present work had the objective of developing composites of PVC/Cork with load proportions, of different granulometric aspects, of 5 and 10%. The composites were processed into a single screw extruder, then compression molded in a hydraulic press and evaluated for thermal behavior by thermogravimetry, vertical flammability test, and morphological characterization by optical microscopy and scanning electron. The results indicated that, regardless of the content and grain size of the cork, the thermal stability of the composites was not significantly altered. As for flammability, all composites were classified as V-0, with a flame extinction time lower than the pure matrix, especially in the presence of 10% of cork. Morphologically the composites showed formation of agglomerates, pores and low adhesion.
Keywords
Referências
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Submetido em:
09/04/2020
Aceito em:
05/11/2020
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