三乙烯二胺交联季铵化聚芳醚砜电解质膜的制备与性能

Preparation and Properties of Triethylene Diamine Cross-Linked Quaternized Poly(arylene ether sulfone) s Based Polyelectrolyte Membranes

采用聚芳醚砜为原料,经付克氯甲基化反应,以三乙烯二胺为交联剂,通过非均相和均相2种季铵化方式制备了2类燃料电池用交联型阴离子交换膜CQPAES。所制备CQPAES膜的离子交换容量为1. 15～1. 25 mmol/g。与非交联膜相比,交联膜的耐溶剂性、尺寸稳定性均得到了提高,在高温高压水中的水解稳定性、强碱条件下的化学稳定性显著增强。季铵化方式对交联膜性能影响的研究表明,均相季铵化膜与非均相季铵化膜相比,可更好地控制交联膜的溶胀,相应交联膜的离子电导率更高。交联剂加入量为0. 1～0. 2时,交联膜的综合性能最佳。

Two types of cross-linked anion exchange membranes（AEMs） were successfully prepared by homogenous and heterogeneous quaternization of chloromethylated poly（arylene ether sulfone） s（CQPAES）,which were obtained by the Friedel-Crafts chloromethylation of poly（arylene ether sulfone） s,using trimethy amine and triethylene diamine（DABCO） as amination and cross-linking reagent,respectively. The ion exchange capacity of the obtained CQPAES membranes is in the range of 1. 15 mmol/g to 1. 25 mmol/g. Compared with the uncross-linked ones,the CQPAES membranes exhibit enhanced solvent resistance and suppressed water swelling,as well as improved hydrolytic stability and chemical stability towards alkali solution. The effect of amination method was also investigated. The results indicate that the CQPAES membranes obtained by homogeneous amination have better dimensional stability and ion conductivity than those gained by heterogeneous amination. The CQPAES membranes with the DABCO content of 0. 1 ～ 0. 2 show satisfactory comprehensive performance for fuel cell applications.