Analysis of the mechanical properties and characterization by solid state 13C NMR of recycled EVA copolymer/silica composites

AUTOR(ES)

Stael, Giovanni Chaves, Rocha, Marisa Cristina Guimarães, Sônia Maria Cabral de, Menezes, d'Almeida, José Roberto Morais, Ruiz, Naira Machado da Silva

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2005-09

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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