The effect of gelation sequence on the mechanical properties of plasticized polyurethane poly(glycidyl methacrylate) simultaneous interpenetrating network

The simultaneous interpenetrating network samples with different gelation s equences based on plasticized polyurethane(PU) and poly(glycidyl mechacryla te)(PGMA) were prepared by changing the PU catalyst. The kinetics of networ k formation was monitored by FTIR. The obtained samples with different gela tion sequences show opposite physical and mechanical properties. The sample with PU gelling first is transparent and brittle, while the sample with PG MA gelling first is opaque and highly elastic. The transmission electron mi croscopy(TEM) and dynamic mechanical analysis(DMA) methods were used to inv estigate the microstructures of these samples from different aspects to exp lain their completely different properties.