基于磺化聚芳醚砜/交联聚丙烯酰胺的semi-IPN质子交换膜的制备及性能

Preparation of semi-IPN proton exchange membranes based on sulfonated poly(arylene ether sulfone)/crosslinking polyacrylamide and their characterization

以4,4’-二氟二苯砜、4,4’-联苯二酚、3,3’-二磺化-4,4’-二氟二苯砜钠盐为原料,经亲核取代共聚反应,合成了磺化聚芳醚砜(SPAES)聚合物。以偶氮二异丁腈为引发剂,丙烯酰胺、N,N-亚甲基双丙烯酰胺为原料,经自由基聚合合成了交联聚丙烯酰胺(CPAM),利用溶液浇铸法制备了一系列半互穿聚合物网络结构质子交换膜(semi-IPN-SPAES/CPAM)。研究了该系列膜的离子交换容量、吸水率、尺寸变化率、质子导电率及水解稳定性。结果表明,该类质子交换膜具有较低的吸水率、良好的尺寸稳定性、较高的质子导电率及水解稳定性。与不含semi-IPN结构的SPAES膜相比,semi-IPN-SPAES/CPAM膜在低湿度条件下的质子导电率有了大幅度的提升。

Sulfonated poly（arylene ether sulfone） （SPAES） copolymers have been successfully synthesized from 4,4＇-difluorodi- phenyl sulfone, 4,4 ＇-bisphenol and 3,3 ＇-disulfonate-4,4 ＇-difluorodiphenyl sulfone via nucleophilic substitution polymerization. Crosslinking polyacrylamide （CPAM） has also been prepared from acrylamide and N, N-methylene-his-aerylamide using azobi- sisobutyronitrile as initiator through radical polymerization. Subsequently, during the solution casting procedure, a series of membranes with semi-polymer interpenetrating network structure （semi-IPN-SPAES/CPAM） have been prepared. Ion exchange capacity, water uptake, dimensional change, proton conductivity as well as hydrolytic stability of the obtained membranes were investigated. The semi-IPN membranes showed low water uptakes, good dimensional stability, high proton conductivity and good hydrolytic stability. Compared with the un-modified SPAES membranes, they also showed significantly enhanced proton conduc- tivity under low relative humidity.