膜科学与技术

季铵化壳聚糖-聚乙烯醇阴离子交换膜的性能

作者：伍艳辉，张海峰，谭惠芬，李佟茗

单位：同济大学化学系

关键词：季铵化壳聚糖；阴离子交换膜；导电率；甲醇渗透性

出版年,卷(期):页码： 2011,31(1):41-46

摘要：

碱性直接甲醇燃料电池(ADMFC)具有电极反应速率高，甲醇渗透率低的优点，阴离子交换膜是ADMFC的核心之一。论文以壳聚糖(CS)和环氧丙基三甲基氯化铵为原料合成季铵化壳聚糖，将其与聚乙烯醇(PVA)共混后制得一系列不同配比的季铵化壳聚糖(QCS)/聚乙烯醇阴离子交换膜，对膜的导电率和甲醇渗透系数进行了测试和分析。结果表明：季铵化壳聚糖与聚乙烯醇有较好的相容性，所制季铵化壳聚糖(QCS)/聚乙烯醇共混膜结构致密均匀，膜的吸水率和溶胀度随季铵化壳聚糖含量增大而减小，离子导电率随季铵化壳聚糖含量增大而提高， 80℃时季铵化壳聚糖含量为60%的共混膜导电率最高可达2.5×10-2 S/cm。膜的甲醇渗透系数低于Nafion膜。

Anion exchange membrane is the heart of alkaline direct methanol fuel cell(ADMFC). Through reaction of chitosan with (2,3-epoxypropyl) trimethylammonium chloride，quaternary ammonium groups were grafted onto the chitosan matrix successfully with high substitution degree (94.8%). A series of novel anion exchange membranes based on quaternized chitosan and poly(vinyl alcohol) blends were prepared and characterized. The morphology of the blend membranes showed that its structure was compact and uniform， which might lead to the decrease of methanol permeability. The ionic conductivity of these new anion exchange membranes rose with increasing content of quaternized chitosan. The ionic conductivity of the membrane containing 60% quaternized chitosan reached 2.5×10-2 S/cm at 80 ℃.The methanol permeability coefficients of the membranes were lower than that of Nafion 117.
Key words: quaternized chitosan; anion exchange membrane; ionic conductivity; methanol permeabiliy

伍艳辉（1972- ），江西吉安人，博士，副教授，从事膜与膜过程，催化反应

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