Radiation crosslinked product of bromobutyl rubber(BIIR)was achieved by electron beam(EB)irradiation curing.Gelling dose of BIIR was estimated to be 12 kGy.Various polyvinyl monomers were tested to enhance EB crosslinking of BIIR in order to obtain a high crosslinking degree at a low dose to avoid main chain degradation under high dose irradiation.It was found that TMPT(trimethylolpropane trimethacrylate)was the most effective crosslinking sensitizer to increase the crosslinking density of BIIR.The tensile strength of EB crosslinked BIIR was significantly improved by using TMPT as the sensitizer.