本研究是基于聚(2,6-二甲基-1,4-苯撑氧)(PPO)所进行的系列改性工作.PPO进行溴化,得到两种溴化度的溴化PPO(BPPO),再进行羟基化和季铵化反应,随后与小分子烷氧基硅烷进行sol- gel反应,热处理后将膜浸泡在碱液中转化为OH-型,得到两种系列的碱性阴离子交换膜.膜具有平整均一的外观形貌和良好的机械性能(4.5～12 MPa,36％～58％),膜的厚度范围为0.09～0.12 mm.水含量(WRoH)范围为62％～1450％,离子交换容量为1.6～2.2 mmol/g.膜具有良好的抗碱能力,在2 mol/L NaOH中浸泡192 h后,其IEC仍能保持在原有的82％以上.低溴化度BPPO制备的膜具有更高的抗溶胀能力,在60℃水中浸泡44 h后,溶胀度范围为117％～297％,高溴化度BPPO制备的膜有高的电导率(室温条件下为0.036～0.041 S/cm),说明所制备的碱性阴离子交换膜有潜力应用于碱性膜燃料电池领域.
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