Synthesis and High Alkaline Chemical Stability of Polyionic Liquids with Methylpyrrolidinium, Methylpiperidinium, Methylazepanium, Methylazocanium, and Methylazonanium Cations
Synthesis and High Alkaline Chemical Stability of Polyionic Liquids with Methylpyrrolidinium, Methylpiperidinium, Methylazepanium, Methylazocanium, and Methylazonanium Cations
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DOI：
10.1021/acsmacrolett.9b00039
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发表时间：
2019-05-01
影响因子：
7.015
通讯作者：
Elabd, Yossef A.
中科院分区：
文献类型：
--
作者：
Sun, Rui;Elabd, Yossef A.
在本文中，我们提出了五种苯乙烯基聚（离子液体）（PIL）的合成，这些PIL含有（共价连接的）具有各种环尺寸的饱和N-杂环阳离子（即，甲基吡咯烷鎓、甲基哌啶鎓、甲基氮杂环庚三烯、甲基氮杂环庚三烯和甲基氮杂环庚三烯）。对于具有5-、6-、7-和8-元环阳离子的PIL，在80 ℃下在40摩尔当量的KOH（D2 O中的1.0 M KOH）中4周后，通过H-NMR光谱证实了高碱性化学稳定性;这是持久碱性燃料电池中聚合物电解质隔板的要求。此外，PIL的离子电导率随着水含量的增加而增加了4个数量级，其中观察到主渗流幂律曲线，即对于所有PIL，无论阳离子大小，电导率与水体积分数相似。
Herein, we present the synthesis of five styrene-based poly(ionic liquids) (PILs) containing (covalently linked) saturated N-heterocyclic cations with various ring sizes (i.e., methylpyrrolidinium, methylpiperidinium, methylazepanium, methylazocanium, and methylazonanium). High alkaline chemical stability was confirmed by H-1 NMR spectroscopy after 4 weeks in 40 mol equiv of KOH (1.0 M KOH in D2O) at 80 degrees C for PILs with 5-, 6-, 7-, and 8-membered ring cations; a requirement for polymer electrolyte separators in long-lasting alkaline fuel cells. Additionally, ion conductivity of PILs increased by 4 orders of magnitude with increasing water content, where a master percolation power law curve was observed, that is, similar conductivity versus water volume fraction for all PILs, regardless of cation size.