The interpenetrating polymer networks of polyurethane-poly (methyl methacrylate) were synthesized by simultaneous polymerization under 11,000 kg/㎠ pressure and 100℃. The conventional simultaneous IPN's were also prepared under atmospheric pressure for comparison.
The dynamic mechanical properties, glass transition behavior, morphology, thermal stability and density of the high pressure IPN's were compared with the conventional IPN's. The morphology of the high pressure IPN's showed that PU and PMMA were well mixed to maintain co-continuity. The dynamic mechanical properties and glass transition behavior showed increased degree of mixing (interpeneration) in high pressure IPN's compared to the conventional IPN's. Enhanced thermal stability was also noted in high pressure IPN's.
