论文部分内容阅读
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/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℃时热稳定性优良,离子交换容量可达到1.091 41 mmol/g。具有在中低温型碱性直接甲醇燃料电池中使用的潜力。
A sol-gel reaction was performed by adding tetraethyl orthosilicate (TEOS) to a mixed aqueous solution of a polymer of quaternized polyvinyl alcohol (QPVA) and polydimethyldiallylammonium chloride (PDADMAC) to prepare a Different proportions of sol-gel casting solution, and the casting solution was dried in a mold to obtain a hybrid membrane, followed by crosslinking the hybrid membrane in a glutaraldehyde / acetone solution to obtain a dimensionally stable hybrid anion exchange membrane. The effect of mass ratio of quaternized polyvinyl alcohol to polydimethyldiallylammonium chloride on the stability of hybrid membranes was investigated. The appearance, infrared spectra, microstructure, thermal stability, water / methanol ratio and membrane ion exchange capacity of four kinds of size-stable anion exchange membranes were mainly analyzed. The results showed that the QPVA / 0.25PDADMAC / 0.1TEOS basic hybrid membrane was stable in size and dense in microstructure. The thermal stability of QPVA / 0.25PDADMAC / 0.1TEOS was excellent at 65-140 ℃, and the ion exchange capacity reached 1.091 41 mmol / g. Has the potential in the use of low-temperature alkaline direct methanol fuel cell.