HDPE films irradiated to 200 kGy in N2 were grafted with vinyl benzyltrimethylammonium chloride(VBTAC)to synthesize a strong base anion-exchange membrane.Comonomer grafting technique was used owing to the difficulty of direct graft polymerization of VBTAC onto polyethylene.Dimethylaminoethyl methacrylate(DMAEMA)

a relative weak acid monomer

was selected as a co-monomer to promote graft polymerization of VBTAC.The grafting conditions

as well as the compositions of grafted films were investigated.The distribution of grafted basic group in polymer substrate was measured by an X-ray microanalyzer.