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Abstract

Diglycidylether-terminated polydimethylsiloxane (DGETPDMS) toughened epoxy matrix systems were developed and further modified with bismaleimide (BMI), namely N,N‘-bismaleimido-4,4‘-diphenylsulfone. The matrix systems were cured using 4,4‘-diaminodiphenylmethane (DDM) as curing agent. The mechanical, thermal, and electrical properties were studied by standard test methods. The introduction of DGETPDMS into epoxy resin improved the impact strength with reduction of tensile strength, flexural strength and glass transition temperature in comparison with the unmodified epoxy, whereas the incorporation of BMI into epoxy resin improved tensile strength, flexural strength, glass transition temperature and heat distortion temperature in comparison with the unmodified epoxy resin. The incorporation of BMI into DGETPDMS-modified epoxy resin improved thermal stability, dielectric strength, surface resistivity, and arc resistance with increasing loading level. SEM micrographs of both BMI-modified epoxy and BMI-modified DGETPDMS-epoxy systems exhibited homogeneous morphology.

Keywords

Epoxy resin diglycidylether-terminated-polydimethylsiloxane bismaleimide tensile strength glass transition temperature and morphology

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Studies on the Synthesis and Characterization of Diglycidylether-terminated Polydimethyl Siloxane-modified Epoxy-Bismaleimide Matrices

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