Abstract: Five series of polyepichlorohydrin-based polyLirethane/poly(methyl methacrylate)interpenetrating polymer networks(PU(PECH)/PMMA IPNs)were synthesized by adjust-ing composition,molecular weight ofPECH,R vahe(isocyanate /hydroxyl ratio),iso-cyanate and crosslinking reagent contents of PU and PMMA,respectively.The tensilestrength,elongation at break and modulus of IPNs were measured,and they varied with thesynthetic condition greatly.DSC,TEM,dynamic mechanical spectroscopy were employed toexplain the changes of mechanical properties.Changes in structure,such as crosslink, inter-penetration and entanglement result in the changes of mechanical properties.

Key words: polyepichlorohydrin polytirethane, poly(methyl methacrylate), IPN, dynamiC me-chanical spectroscopy, morphology