Abstract The post radiation grafting of vinyl acetate onto poly(tetrafluoroethylene) film was studied over a wide range of reaction conditions. The effect of solvent, radiation intensity, monomer concentration and temperature on the grafting yield was investigated. The dependence of the grafting rate on radiation intensity and monomer concentration was found to be 0.49 and 1.7, respectively. The final degree of grafting was found to increase with radiation dose and monomer concentration. The overall activation energy for this grafting system was found to be 4.1 and -4.8 kcal/mol above and below 35°C, respectively. Some properties of the graft copolymer such as water uptake and electrical conductivity were also investigated. The graft copolymer films showed good thermal and chemical stability. The possibility of using these grafted membranes in practical applications is very promising.