膜科学与技术

PPO/SiO2碱性阴离子交换膜的制备与表征

作者：徐铜文吴永会罗婧艺

单位：中国科学技术大学化学系

关键词：聚(2,6-二甲基-1,4-苯撑氧)(PPO)；杂化膜；阴离子交换膜；燃料电池

出版年,卷(期):页码： 2011,31(3):192-195

摘要：

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62–145%，离子交换容量为1.6– 2.2mmol/g. 膜具有良好的抗碱能力，在2 mol/L NaOH中浸泡192h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涨能力，在60ºC水中浸泡44h后，溶涨度范围为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。

This investigation is one of the series works based on the modifcation of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO). Two types of brominated PPO (BPPO) are obtained after bromination. Then the BPPO is endured hydroxylation and quaternization, followed by sol-gel reaction with small alkoxysilanes to prepare hybrid membranes. After heat treatment, the membranes are immersed in alkaline solution. Hence, two types of alkaline (OH- form) anion exchange membranes are obtained. The membranes are smooth and homogenous, and have favorable mechanical properties (4.5–12 MPa，36–58%). The thickness is in the range of 0.09 - 0.12 mm. The water uptake (WR-OH) is in the range of 62–145%. The ion exchange capacity ranges from 1.6 mmol/g to 2.2 mmol/g. The membranes have favorable alkaline resistance. After being immersed in 2 mol/L NaOH for 192h，the membrane IECs can still keep their original 82％ or higher.
Membranes prepared from BPPO of low bromination degree (34.6%) have higher swelling resistance. The swelling degree is in the range of 117-297% after being immersed in 60ºC water for 44h. Membranes prepared from BPPO of high bromination degree (53.1%) have higher conductivity. The conductivity is in the range of 0.036-0.041 S/cm at room temperature，indicating the PPO/SiO2 alkaline anion exchange membranes have potential application in alkaline membrane fuel cells.

徐铜文（1967－），男，教授，电话.: +86-551-360-1587. E-mail: twxu@ustc.edu.cn (T. W. Xu).

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