环状铵离子功能化聚氯乙烯阴离子交换膜的制备

Preparation of cyclic ammonium ion functionalized polyvinyl chloride alkaline anion membranes

以聚氯乙烯为原料,通过接枝反应引入N-甲基哌啶和N-甲基吡咯烷两种环状铵离子,成功制备了甲基吡咯铵离子官能化聚氯乙烯(Pyr-PVC)及甲基哌啶铵离子官能化聚氯乙烯(Pip-PVC),并对该系列碱性阴离子膜的离子导电率、力学性能、氧化稳定性等进行了测试。结果表明:Pip-PVC和Pyr-PVC在80℃时的离子导电率均最高,分别为75.3,79.4 mS/cm,而其吸水率和溶胀度维持在较低的水平;Pip-PVC和Pyr-PVC的拉伸强度为19.3~29.9 MPa,断裂伸长率为42.5%~70.2%。该碱性阴离子膜所用原料成本较低,在碱性燃料电池、海水淡化等领域应用前景较好。

Two cyclic ammonium ions,N-methylpiperidine and N-methylpyrrolidine,were introduced onto polyvinyl chloride via grafting to prepare methylpyrrolidine anion functionalized polyvinyl chloride(Pyr-PVC)and methylpiperidine anion functionalized polyvinyl chloride(Pip-PVC).The ionic conductivity,mechanical properties and oxidation stability of the series of ionic membranes were characterized.The results show that the ionic conductivity of Pip-PVC and Pyr-PVC anion membranes peak as 75.3 mS/cm and 79.4 mS/cm at 80℃respectively,while whose water absorption and swelling degree are maintained at a relatively low level.The tensile strength of Pip-PVC and Pyr-PVC are within 19.3 to 29.9 MPa,and the elongation at break are 42.5%-70.2%.The raw material cost of the alkaline anion membranes prepared in this work is relatively low,making it promising in the fields of alkaline fuel cells and seawater desalination.