Estudo sobre a formação de microporos em filmes de PLA e em blendas PLA/PBAT pelo método breath figure / Study on formation of microporous in PLA films and PLA/PBAT blends by breath figure method
DOI:
https://doi.org/10.34117/bjdv7n2-360Keywords:
Superfícies porosas, breath figures, blendas.Abstract
Filmes microporosos de PLA puro e de blendas PLA/PBAT foram preparados pelo método de automontagem denominado breath figure. Diferentes fatores influenciam a formação dos poros, entre eles foram investigados o efeito do solvente, da concentração, da natureza dos polímeros PLA e PBAT e da adição de PBAT em blendas PLA/PBAT com composição 95/5 e 70/30. As imagens de microscopia óptica mostraram que o diclorometano é o melhor solvente para obter poros com tamanhos mais regulares nos filmes de PLA puro e nas blendas com composição 95/5. A estrutura linear dos polímeros PLA e PBAT não contribuíram para a estabilizar e evitar a coalescia das gotículas de água, resultando em poros com distribuição de tamanho aleatória. Blendas contendo 5 e 30% de PBAT apresentaram poros com tamanhos mais regulares para soluções preparadas com concentrações de 1 e 2% (m/v).
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