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Um material durável e resistente

Um material durável e resistente

Fayçal Baira

65,61 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Química física
ISBN:
9786208497309
65,61 €
IVA incluido
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Sobre IBD

Os hidrocarbonetos, a principal fonte de materiais plásticos, estão ameaçados de esgotamento. Embora os plásticos ofereçam vantagens como a elevada resistência aos agentes atmosféricos, a facilidade de utilização e os custos moderados, a gestão do seu fim de vida constitui um problema. Esta tese explora a utilização de um polímero natural, a celulose, como alternativa sustentável.A celulose, extraída da madeira, do algodão, etc., pode ser modificada por esterificação para se tornar apolar. Combinada com diacrilato de poliuretano em várias percentagens, forma materiais compósitos que são biodegradáveis em condições naturais (solo, luz solar, etc.). Estes compósitos têm uma boa resistência ao vapor de água e aos solventes não polares, mas uma fraca resistência aos solventes de média polaridade.Os principais factores que influenciam a resistência à humidade são : Comprimento da cadeia de carbono. O impedimento estérico, determinado pelo tipo de éster. O grau de substituição.Este estudo realça o potencial da celulose como uma solução ecológica para reduzir a dependência dos plásticos à base de hidrocarbonetos.

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