Sulfonated proton exchange membrane is a kind of ion exchange membrane with high thermal stability

chemical stability and good mechanical properties

having extremely broad application prospects. Numerous free radicals can be generated when the poly(vinylidene fluoride)(PVDF) membrane was irradiated by 60Co γ-source

acting as active sites for the graft of 4-sulfonyl chloride vinylbenzene monomer

thus the proton exchange membrane can be prepared by subsequent alkaline and acid treatment. And the structures of the monomer

the original PVDF and grafted PVDF membrane were confirmed by FT-IR spectra

indicating that the monomer had been successfully grafted into PVDF membrane. This proton exchange membrane shows good thermal stability

also can meet the requirement of the temperature of proton exchange membrane fuel cells. The relationship of the proton conductivity

water uptake

ionic exchange capacity with degree of graft at different does rate but same total does were studied. The results showed that when the does rate was 40 Gy·min-1

the degree of graft of the membrane was 52.7%

ionic exchange capacity was 1.274 mmol·g-1

water uptake was 36.85% and conductivity was 136 mS·cm-1 at 80℃.