Energy Absorption of Polyurethane-Based Polymer Alloys

摘要

Interpenetrating polymer networks (IPNs), elastomers and foams composed of polyurethanes and epoxies were prepared by the simultaneous technique. The effect of platelet geometry fillers (e.g. graphite, mica, glass) and cure time on the morphology of the IPNs was investigated. Fillers were incorporated by random batch mixing and the rubber roll mill technique. It was determined that low level of filler resulted in a small increase of dynamic mechanical properties (tan delta) and as the filler level increased, tan delta decreased. Samples with low post-curing times showed higher magnitudes of tan delta than samples with longer post-curing time. IPN foams with different ratios of polyurethane and epoxy were prepared and their sound absorption properties were measured by the impudance tube method. Different PU/Epoxy ratios showed different maximum sound absorption frequency ranges. In general, the IPN foams prepared showed higher sound absorption properties than the GM polyurethane foam reference.