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Étude comparative de l’incorporation de charges minérales dans le PEHD

Étude comparative de l’incorporation de charges minérales dans le PEHD

Linda Gouissem

65,61 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Química
ISBN:
9786209065965
65,61 €
IVA incluido
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Sobre IBD

Les plastiques sont rarement utilisés à l’état pur et sont souvent modifiés par l’ajout de charges minérales pour améliorer leurs propriétés ou réduire les coûts. Ce travail étudie l’effet du carbonate de calcium (CaCO₃) et de la perlite expansée sur le polyéthylène haute densité (PEHD). Des formulations contenant 5 à 20 % en volume ont été préparées avec un plastographe Brabender (220 °C, 30 tr/min). Les résultats montrent que la viscosité augmente mais reste compatible avec la transformation. Le module d’élasticité s’améliore nettement avec le CaCO₃, alors que la perlite induit une amélioration plus modérée. L’allongement à la rupture progresse pour 5 et 10 % de CaCO₃, mais diminue avec la perlite, traduisant une fragilisation. La contrainte à la rupture baisse au-delà de 10 % pour les deux charges. L’analyse DSC révèle une diminution de la température de fusion, légère avec le CaCO₃ mais plus marquée avec la perlite. Enfin, le MEB confirme une bonne dispersion et, pour le PEHD/Perlite, un comportement fragile-ductile.

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