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Bioplástico colorido: corantes naturais como uma alternativa para coloração de poli(3-hidroxibutirato)
Summary
This Brazilian study developed colored films made from the biodegradable bioplastic poly(3-hydroxybutyrate) with natural dyes, as an alternative to conventional petroleum-based plastics. Bioplastics that fully biodegrade are important for reducing the accumulation of microplastics in soil and aquatic environments.
Plásticos convencionais são grandes poluidores ambientais e, por consequência, há um interesse em materiais alternativos sustentáveis e biodegradáveis. Frente a isso, o Poli(3-hidroxibutirato) vem sendo estudado como um possível substituto. Neste trabalho, foram apresentados os resultados do desenvolvimento de filmes coloridos baseados em P(3HB) adicionados de corantes naturais comumente utilizados na indústria de alimentos, visando aumentar a variedade de aplicações do bioplástico. Os corantes páprica, urucum, mostarda e cúrcuma demonstraram capacidade em colorir o bioplástico nas diferentes concentrações testadas, permitindo uma gama de tonalidades disponíveis. Quando submetidos ao ensaio de fotodegradação, os filmes descoloriram sem, no entanto, perder a tonalidade das cores iniciais. A presença dos corantes protegeu as superfícies dos filmes, bem como sua inserção não afetou as propriedades térmicas do P(3HB). Os filmes de P(3HB) coloridos obtidos se mostram alinhados às novas concepções no desenvolvimento de materiais adequados à sustentabilidade.
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