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Abstract

Interpenetrating polymer networks of bismaleimide-modified polyurethane-epoxy systems were developed using chain-extended bismaleimide (BMI) and polyurethane-modified epoxy with 4,4′-diamino-diphenylmethane as curative. Infrared spectral analysis was used to confirm the polyurethane cross-linked epoxy (PU-EP). The chain-extended BMI was synthesized from a previously reported procedure and its structure and purity was confirmed by FTIR, ¹H and ¹³C-NMR spectra. The prepared matrices were characterized by mechanical, water absorption, thermal and electrical studies. The results obtained from these studies indicate that the incorporation of polyurethane into epoxy increases the mechanical strength and water absorption behavior and decreases the thermal and electrical properties of epoxy resin. Whereas, the incorporation of chain-extended bismaleimide into a polyurethane-modified epoxy system increases the tensile and flexural properties, thermal stability, and electrical properties of epoxy resin and decreases the impact strength, water absorption behavior, glass transition temperature and heat distortion temperature according to its percentage content.

Keywords

Epoxy resin chain-extended bismaleimides polyurethane tensile strength glass transition temperature thermal stability electrical properties

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Synthesis and Characterization of Polyurethane-Toughened Epoxy-Bismaleimide Matrices

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