PFA fluoropolymer-based cationic exchange membranes with various the degrees of grafting and thicknesses were prepared by a γ-ray radiation grafting of styrene and a subsequent sullonation. The influence of the degree 이‘ grafting and thickness on the physio-chemical properties of the membranes, such as ion exchange capacity, degree of sultonation, water uptake, and proton conductivity were investigated in this study.