季铵化聚芳吲哚阴离子膜的制备

Preparation of quaternized poly (aryl indole) anion exchange membrane

通过吲哚2,3二酮和联苯在超强酸催化下反应,合成了不含芳基醚键的聚芳吲哚聚合物,而后通过酰胺与2,3环氧丙基三甲基氯化铵反应,成功制备了一种新的季铵化聚芳吲哚阴离子交换膜.由于不含芳基醚键,有效减弱了OH-对膜主链骨架的攻击,提高了膜的耐碱性.膜浸泡在80℃的1 mol/L KOH水溶液中672 h后,其离子电导率和离子交换容量分别达到测试前的84%和89%,证明其具有良好的耐碱性.将该膜制备成膜电极,在80℃下测试单电池性能,开路电压为0.97 V,在电流密度为150 mA/cm^2时最大功率密度达到68 mW/cm^2.

The poly(aryl indole)polymers without aryl ether bond were synthesized through indole-2,3-dione and biphenyl by super acid catalyzed,and then followed the reaction by the amide with 2,3-epoxypropyl trimethyl ammonium chloride.A novel quaternized poly(aryl indole)anion exchange membrane was successfully prepared.Since the aryl ether bond was absent,it was effectively reduced that the attack on the main chain skeleton of the membrane from hydroxide,improving the alkali resistance of the membrane.Moreover,after immersed in the 1 mol/L KOH aqueous solution for 672 h at 80℃,ionic conductivity and ion exchange capacity of the PBN 72GA membrane has reached 84%and 89%of initial value,respectively.This proved the membrane had good alkali resistance.Moreover,the membrane electrode assembly was prepared by the membrane and the performance of the fuel cell was tested at 80℃.The fuel cell established the open circuit voltage of 0.97 V and the maximum power density was up to 68 mW/cm^2 when the current density was 150 mA/cm^2.