Abstract:

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℃.

Key words: radiation, poly (vinylidene fluoride), irradiation grafting, proton exchange membrane

摘要：

含氟磺酸型质子交换膜是一类具有高热稳定性、化学稳定性及良好力学性能的离子交换膜，具有极其广阔的应用前景。采用⁶⁰Co辐照接枝技术，在聚偏氟乙烯（PVDF）基膜上产生自由基聚合位点，进而接枝对苯乙烯磺酰氯单体，经过一定条件酸碱处理得到一种新型偏氟磺酸型质子交换膜。并对其进行红外分析，结果显示PVDF膜上成功接枝上了对苯乙烯磺酰氯单体；定量研究了在相同辐照总剂量、不同剂量率条件下，所得质子交换膜的质子传导率、吸水率及离子交换容量与接枝率的关系，结果表明：当剂量率为40 Gy·min^-1时，所得质子交换膜接枝率为52.7%，吸水率为36.85%，80℃时质子传导率达到136 mS·cm^-1，离子交换容量为1.274 mmol·g^-1。

关键词: 辐照, 聚偏氟乙烯, 辐照接枝, 质子交换膜