INTERPENETRATING POLYMER NETWORKS OF POLYURETHANE AND EPOXY

Interpenetrating polymer networks of polyurethane, based on poly(oxypr opylene)triol grafted with polyacrylonitrile and epoxy, were prepared by a simultaneous polymerization technique. The mechanical properties and morphology of the networks were investigated. As the epoxy content increased, the tensile strength of the interpenetrating polymer netwo rks or the graft networks (in which some grafting reaction has taken p lace between polyurethane and the pendant hydroxyl group of epoxy) dec reased. The shifts of the loss modulus peaks of the interpenetrating p olymer networks and the graft-IPNs were different and their tan delta peaks shifted to a high temperature as the epoxy content increased.