芳烯
乙醚
膜
芳基
聚合物
化学
离子交换
共聚物
化学稳定性
聚苯乙烯
离子
高分子化学
联苯
材料科学
有机化学
烷基
生物化学
作者
Angela D. Mohanty,Steven E. Tignor,Jessica A. Krause,Yoong‐Kee Choe,Chulsung Bae
出处
期刊:Macromolecules
[American Chemical Society]
日期:2016-04-26
卷期号:49 (9): 3361-3372
被引量:326
标识
DOI:10.1021/acs.macromol.5b02550
摘要
Anion exchange membranes are an important component in alkaline electrochemical energy conversion and storage devices, and their alkaline stability plays a crucial role for the long-term use of these devices. Herein, a systematic study was conducted for the analysis of polymer backbone chemical stability in alkaline media. Nine representative polymer structures including poly(arylene ether)s, poly(biphenyl alkylene)s, and polystyrene block copolymers were investigated for their alkaline stability. Polymers with aryl ether bonds in their repeating unit showed poor chemical stability when treated with KOH and NaOCH3 solutions, whereas polymers without aryl ether bonds [e.g., poly(biphenyl alkylene)s and polystyrene block copolymers] remained stable. Additional NMR studies and density functional theory (DFT) calculations of small molecule model compounds that mimic the chemical structures of poly(arylene ether)s confirmed that electron-withdrawing groups near to the aryl ether bonds in the repeating unit accelerate chemical degradation. Results from this study suggest that the use of all-carbon-based polymer repeating units (i.e., polymers not bearing aryl ether bonds) can enhance long-term alkaline stability of anion exchange membranes in electrochemical energy devices.
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