质子交换膜用磺化聚芳醚的合成与性能研究

Synthesis and Properties of Sulfonated Poly(arylene ether) for Proton Exchange Membrane

合成了一种用于质子交换膜的新型磺化聚芳醚.由于特殊单体结构的设计,在聚合物主链上引入取代基对主链进行保护,用氯磺酸直接磺化方法在聚芳醚高分子侧基上引入磺酸功能基,实现了聚合物磺化结构的可控定位合成,得到了稳定性较好的磺化聚芳醚.用溶液浇膜法制备了质子交换膜,考察了质子交换膜的各种性能.结果表明,这种膜具有良好的成膜性,水解性稳定性和优异热稳定性能,5%的热失重温度为362.3℃.氧化稳定性在80℃的Fenton’s试剂(3%的过氧化氢和2mg/L的FeSO4)中进行,膜在69min时才开始变碎,表现出良好的氧化稳定性.

Novel sulfonated poly（arylene ether） containing triphenyl moieties as polymer electrolytes for fuel cell application was successfully synthesized. The sulfonic acid function was only attached at the para positions on the pendant phenyl rings due to the novel sulfonated poly（arylene ether） structures designed. The sulfonated polymers are very soluble in common organic solvents, such as dimethyl sulfoxide, N,N-dimethylacetamide, and can be readily cast into tough and smooth films from solutions. The membrane exhibited very high hydrolytic stability （〉7 d） and the polymer is a thermostable polymer with 5% weight loss temperature of about 362.3 ℃. The membrane also shows excellent oxidative stabilities in Fenton＇s reagent （2 mg/L FeSO4 in 3% H2O2）.