![]() ![]() The IPN composite exhibited lower tensile properties than the vinyl ester composite. Tensile and flexural tests were performed on the carbon fiber/IPN and carbon fiber/vinyl ester composites to determine their mechanical response. The presence of the more ductile polyurethane in the IPN matrix depressed the glass transition temperature (from 94 to 84☌), but also served to improve damping response at all frequencies studied. The thermomechanical response of the IPN matrix was compared with that of an unmodified vinyl ester resin. Good compatibility between the two phases in the matrix was achieved and confirmed via differential scanning calorimetry and dynamic mechanical analysis. ![]() The IPN matrix, consisting of a commercially available vinyl ester and polyurethane, was synthesized via a sequential method with vinyl ester as the rigid phase and polyurethane as the flexible phase. In this study, a carbon fiber/vinyl ester‐polyurethane interpenetrating polymer network (IPN) laminate composite was fabricated and characterized for the first time. ![]()
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