The preparation ofPTFE-g-DMAA copolymer has been done by using an irradiation simultaneous technique. The purpose of the work was to obtain a hydrophilic graft copolymer of PTFE-g-DMAA that can be used as a polimer base for making a polymer membrane electrolytes in a fuel cell system. The polytetrafluoro ethylene (PTFE) film was placed in a special designed glass ampoule that containing Di-methylacrylamide (DMAA) monomer and than it was irradiated under vacuum by gamma rays from a Co-60 source.It was found that the graft copolymerization can be only significantly proceeded in the presence of either ethyl acetate or acetone as a solvent. The kinetic study show that the initial grafting rate was proportional to 0.55 power of dose rate and the apparent activation energy was found to be 7.92 kcal/mole. The present age of water up-take was increase linearly with the degree of grafting and also the distribution of grafting chain in the PTFE film substrate suggest that the graft copolymer ofPTFE-g-DMAA was a hydrophilic one. Key words: Garft copolymer, polytetrafluoro ethylene (PTFE), di-methylacrylamide (DMAA). Mirzan T. Razzak1, Agus Salim I Sri YadiaP Adjat Sudradjat2,Ambiyah Soeliwarno2 dan Idrus Kadir J Fakuitas Sains dan Teknologi, UIN Syarif Hidayatullah Jl. Ciputat Raya, Jakarta 2Puslitbang Teknologi Isotop dan Radiasi (P3TIR) - BATAN Jl. Raya Cinere Pasar Jumat, Jakarta
