A liquid urethane prepolymer encapped with vinyl ether groups (PUE)

was synthesized and characterized．PUE and triethylene glycol divinyl ether (DVE-3) can undergo rapid cationic thermal polymerization in the presence of diphenyliodonium hexafluorophosphate (H810) at different temperatures．The polymerization conversion of vinyl ether is pretty high．Thermal polymerization temperature for these systems is much lower than the decomposition temperature of neat P1810．The initiation mechanism is presumably based on electron transfer from eleetron-rich vinyl ether to electron-deficient diphenyliodonium salt The influence of vinyl ether on the thermal polymerization of epoxy resin/diphenyJiodonium salt was also investigated.