Membrane of fuel cell has been prepared by grafted pre-irradiation. Matrix of ETF15, PTFE, and
cross-linked PTFE (PTFE(cD) _films have been irradiated by y-ray at various total dose from 2.5 - 12.5
kGy and various dose rate at 1.9, 1.6, and 1.3 kGy/hour. Irradiated films are then grafted by styrene
monomer in various solvent: ethanol, 2-propanoL and toluene with various concentration _[rom 20 - 60%
volume, various grafting temperature from 30 - 90°C and various grafting time from 2 - 12 hours.
Obtained the good relative condition to grafted pre-irradiation such as using 1,9 kGy/hour dose rate, 10
kGy total dose, 2-propane! solvent, 40% volume styrene 4 hours grafting time, and 70°C grafting
temperature gave percent of grafting ETFE-g-S = 46.69% weight, PTFE-g-S = 11.13% weight, dan
PTFE(cU-g-S = 31.07% weight.
