Composite polymer networks CPNs

based on hydroxyl terminated unsaturated polyester/polyurethanes were synthesized. The influences of chemical kinetics and phase separation on physico-mechanical properties were investigated. Data reveal that the composite polymer network of unsaturated polyesterlpolyesterurethane(r = NCO/OH = 0.4) is superior to its counterparts from polyetherurethane or polymethylene polyphenyl isocyanate

PAPI in mechanical properties. An optimum CPN can be designed and prepared via controlling soft and hard segment components and composition of network.