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Estudo comparativo da incorporação de cargas minerais no PEAD

Estudo comparativo da incorporação de cargas minerais no PEAD

Linda Gouissem

65,68 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Química
ISBN:
9786209217203
65,68 €
IVA incluido
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Sobre IBD

Os plásticos raramente são utilizados no seu estado puro e são frequentemente modificados através da adição de cargas minerais para melhorar as suas propriedades ou reduzir os custos. Este trabalho estuda o efeito do carbonato de cálcio (CaCO₃) e da perlite expandida no polietileno de alta densidade (PEAD). Foram preparadas formulações contendo 5 a 20% em volume com um plastógrafo Brabender (220 °C, 30 rpm). Os resultados mostram que a viscosidade aumenta, mas permanece compatível com a transformação. O módulo de elasticidade melhora significativamente com o CaCO₃, enquanto a perlita induz uma melhoria mais moderada. O alongamento na ruptura aumenta para 5 e 10% de CaCO₃, mas diminui com a perlita, refletindo uma fragilização. A tensão de ruptura diminui para além de 10 % para ambas as cargas. A análise DSC revela uma diminuição da temperatura de fusão, ligeira com o CaCO₃, mas mais acentuada com a perlite. Por fim, o MEB confirma uma boa dispersão e, para o PEHD/Perlite, um comportamento frágil-dúctil.

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