季铵化聚乙烯醇/聚二甲基二烯丙基氯化铵/正硅酸乙酯杂化阴离子交换膜的制备与性能表征

Preparation and performance characterization of QPVA/PDADMAC/TEOS hybrid anion-exchange membrane

摘要:

通过在季铵化聚乙烯醇（QPVA）和聚二甲基二烯丙基氯化铵(PDADMAC)混合聚合物水溶液中添加正硅酸乙酯(TEOS)进行溶胶-凝胶反应，制备得到了不同配比的溶胶-凝胶铸膜液，并将各铸膜液在模具中干燥得到杂化膜，随后将杂化膜在戊二醛的丙酮溶液中交联得到尺寸稳定的杂化阴离子交换膜。考察了季铵化聚乙烯醇和聚二甲基二烯丙基氯化铵铸膜液的质量比对杂化膜稳定性的影响。主要分析了4种尺寸稳定阴离子交换膜的外观形貌、红外光谱、微观形貌、热稳定性、含水/甲醇率和膜的离子交换容量。结果表明，QPVA/0.25PDADMAC/0.1TEOS碱性杂化膜在甲醇中尺寸稳定，微观结构致密，在65-140℃温度范围内热稳定性优良，离子交换容量可达到1.09141mmol/g。具有在中低温型碱性直接甲醇燃料电池中使用的潜力。

Abstract:

Some different proportions of the sol-gel casting solutions were prepared by adding tetraethyl orthosilicate (TEOS) to the mixed polymerthe of quaternized polyvinyl alcohol (QPVA) and poly dimethyl diallyl ammonium chloride (PDADMAC) aqueous solution for the sol-gel reaction. Then each of the casting solutions in the mold was dried to obtain the hybrid membrane. After that the hybrid membranes were cross-linking in the glutaraldehyde solution with acetone to obtain a dimensionally stable hybridization anion-exchange membrane. The effect of the mass ratio of the quaternized polyvinyl alcohol to poly dimethyl diallyl ammonium chloride casting solution on the stability of the hybrid membrane was investigated. The topography, infrared spectroscopy, morphology, thermal stability, the rate of aqueous/methanol, and the ion exchange capacity of four dimensional stability anion-exchange membranes were mainly analyzed. The results showed that the basic hybrid membrane of QPVA/0.25PDADMAC/0.1TEOS was dimensionally stable in methanol, dense in the microstructure, and excellent heat stability in 65-140℃. Meanwhile, the ion exchange capacity could be reached to 1.09141mmol/g, and the basic hybrid membrane had potential applications in alkaline direct methanol fuel cell with low temperature.