Avaliação das propriedades térmicas de misturas PLA/SEBS com moringa submetidas a degradação em ambiente marinho
DOI:
https://doi.org/10.33448/rsd-v10i4.13249Palavras-chave:
PLA; SEBS; Pó da folha da moringa oleífera; Ambiente marinho simulado.Resumo
Neste trabalho investigou-se a influência do teor de SEBS e Moringa Oleífera nas propriedades térmicas de blendas PLA/SEBS e de dois biocompósitos baseados em duas dessas blendas. Foram preparadas duas blendas PLA/SEBS (90/10 e 70/30), dois biocompósitos de PLA/SEBS/MO (90/10/1 e 70/30/1) e um biocompósito de PLA/MO (100/1), através da mistura por fusão numa extrusora de matriz aberta. As amostras para biodegradação foram obtidas por prensagem a quente, sendo posteriormente inseridas em ambiente marinho simulado. A evolução da degradação foi avaliada por meio da termogravimetria e calorimetria exploratória diferencial. Foi observado um aumento da cristalinidade de todas as composições avaliadas, e uma redução da estabilidade térmica após a exposição ao ambiente marinho por períodos prolongados. Essa maior cristalinidade pode estar relacionada ao consumo das regiões amorfas e a menor estabilidade térmica está vinculada com a degradação hidrolítica do PLA, devido a água absorvida pela moringa em pó. A avaliação da variação de massa mostrou que as misturas com SEBS e Moringa, apresentaram uma taxa de degradação equivalente ou inferior aquela reportada para o PLA puro.
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