Electron beam(EB)curing of polymer matrix composites offers many particular advantages compared to conventional thermal curing．There has been a considerable development about the EB curing advanced composites for the use of aerospace and other industries in recent years．Most variety of epoxy resin has been confirmed to possess radiation reactivity and have alreody become chief resin matrices used in EB curable composites．The influences of initiator variety and concentration on the curing characterizations of epoxy resin system containing co-initiator benzophenone and isopropanol were analyzed．The variation regularities of temperature during the radiation

the gel fraction

damping factor and dynamic modulus of samples were studied．The experimental results indicate that under the same condition of epoxy resin content and absorbed dos

the addition of co—initiator can enhance the gel fraction of system

hat the enhanced extent of gel fraction does not increase with the increase co—initiator content

there exists an

optimal content of the co-initiator．With the increase of onium salt initiator

the enhanced extent of gel fraction induced by co—initiator will decrease．A temperature peak appears during the radiation

and the influences of co—initiator on the peak temperature and the glass transition temporature are the same as those on the gel fraction． The room temperature modulus and high temperature modulus of cured samples with low content of onium salt initiator have little change before and after the addition of co—initiator．When the diphenyliodonium hexafluorephosphate initiator content is high

the room temperature modulus of samples with co—initiator increases

while the hish temporature modulus has little changes．