季铵化羟乙基纤维素/季铵化聚乙烯醇共混阴离子交换膜的制备与表征

摘要

阴离子交换膜是碱性直接甲醇燃料电池（ADMFC）的核心。本文将季铵化羟乙基纤维素（QHEC）和季铵化聚乙烯醇（QPVA）共混制备了一系列不同配比的QPVA/QHEC阴离子交换膜并对其进行热交联,对膜进行测试和分析,结果表明：膜表面均匀致密,低于300℃膜基本稳定;QPVA/QHEC共混膜的导电率随着QPVA量的增大而增大,在（2.0～7.8）×10-2 s/cm范围内,随着使用温度的升高逐渐升高;QHEC膜对甲醇有很好的阻隔效果,在20℃时,甲醇渗透率最低为2.49×10-6 cm2/s;随QPVA量的增加,共混膜的甲醇渗透率会略有增加。%Anion exchange membrane is the key of alkaline direct methanol fuel cell（ADMFC）.A series of quarternized hydroxyethylcellulose（QHEC）and quaternized poly（vinyl alcohol）（QPVA） blend anion exchange membranes were produced by mixing QPVA and QHEC at different ratios,hot crosslinked and characterized.The morphology of the blend membranes showed that its structure was compact and uniform.TG-DSC showed that the blend membranes were stable below 300 ℃.The conductivity of the composite membrane increased with the content increasing of quaternized poly（vinyl alcohol）and temperature.It was between 2.0×10-2 s/cm and 7.8×10-2 s/cm.The QHEC membrane has good impediment effect to the methanol and the lowest methanol permeability of QHEC membrane was 2.49×10-6 cm2/s at 20 ℃.With the increase of QPVA contents,the methanol permeability of blend membranes would increase slightly.