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Artigo Científico | Tensão e Deformação | Inglês | 10/07/2005
Autores: Giovanni Chaves Stael, José Roberto M. d Almeida, Marisa Cristina Guimarães Rocha, Naira Machado da Silva Ruiz, Sônia Maria Cabral de Menezes
Palavras-chave: composite, eva, nmr, recycling
Resumo: The incorporation of micrometer sized silica particles on poly (ethylene-co-vinyl acetate) – EVA - residues from the footwear industry was evaluated. The effects of the processing parameters – temperature and mixing ratio – on the mechanical behavior of molded plates of neat recycled EVA and EVA/silica composites were also investigated. The mechanical properties measured by the tensile test, the fractographic analysis by scanning electron microscopy (SEM), and the 13C Nuclear Magnetic Resonance (NMR) showed a reduced EVA to silica compatibility. Therefore, incorporation of untreated silica to recycled EVA copolymer produced a slight decrease on the mechanical performance of EVA/silica composites in respect to neat EVA copolymer. The NMR analysis also shows that the crosslinking process on recycled EVA may be occurring at the carbonyl group.
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