Preparation and Characterization of Non-N-Bonded Side-Chain Anion Exchange Membranes Based on Poly(2,6-dimethyl-1,4-phenylene oxide)
Preparation and Characterization of Non-N-Bonded Side-Chain Anion Exchange Membranes Based on Poly(2,6-dimethyl-1,4-phenylene oxide)
复制标题
基于聚(2,6-二甲基-1,4-苯醚)的非N键侧链阴离子交换膜的制备及表征
DOI：
10.1021/acs.iecr.1c04171
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发表时间：
2022-01-21
影响因子：
4.2
通讯作者：
Gao, Shanjun
中科院分区：
文献类型：
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作者：
Chen, Junjie;Zhang, Mingliang;Gao, Shanjun
由于主链上的聚醚结构，季铵化聚（2，6-二甲基-1，4-苯醚）（PPO）阴离子交换膜（AEM）的耐碱性有待提高。通过威廉姆森醚化反应，我们合成了一种新型的具有季铵化哌啶阳离子侧链的PPO基AEM，具有良好的离子电导率（80 ℃时为63.5 mS cm（-1））。由于非N键，其具有良好的耐碱性，在1 mol L-1 KOH溶液中浸泡480 h，电导率损失小于10%。此外，我们还制备了另外两种AEM（N-键合）作为对比，并通过傅里叶变换红外光谱研究了它们的降解机理。研究发现，非N键的PPO基AEM在碱溶液浸泡后OH-电导率损失最小，C-N保留率最高，说明非N键和醚键能有效提高AEM的耐碱性，而电导率并不低于含N键阳离子的AEM。
Due to the polyether structure on the main chain, the alkali resistance of quaternized poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) anion exchange membranes (AEMs) needs to be improved. Through the Williamson etherification reaction, we synthesized a new type of PPO-based AEM with a quaternized piperidine cation side chain, which has good ionic conductivity (63.5 mS cm(-1) at 80 degrees C). Due to being non-N-bonded, it has good alkali resistance, and the conductivity loss is less than 10% when immersed in 1 mol L-1 KOH solution for 480 h. In addition, we also prepared other two AEMs (N-bonded) for comparison and studied their degradation mechanism by Fourier transform infrared spectroscopy. The study found that the non-N-bonded PPO-based AEM has the lowest OH- conductivity loss and its C-N retention is the highest after soaking in alkali, which shows that the non-N bond and the ether bond can effectively improve alkali resistance, while the conductivity is not lower than that of the AEM with N-bonded cations.