Highly Stable N3-Substituted Imidazolium-Based Alkaline Anion Exchange Membranes: Experimental Studies and Theoretical Calculations

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• 作者：Fenglou Gu ; Huilong Dong ; Youyong Li ; Zhihong Si ; Feng Yan
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：January 14, 2014
• 年：2014
• 卷：47
• 期：1
• 页码：208-216
• 全文大小：393K
• ISSN：1520-5835

文摘

Imidazolium cations with various N3-substituents (including methyl, butyl, heptyl, dodecyl, isopropyl, and diphenylmethyl groups) were synthesized and investigated in terms of their alkaline stability. The effect of the N3-substituent on the alkaline stability was studied by quantitative ¹H NMR spectra and density functional theory (GGA-BLYP) calculations. The isopropyl substituted imidazolium cation ([DMIIm]⁺) with the highest LUMO energy value exhibited the highest alkaline stability in aqueous NaOH. The [DMIIm]⁺ cation also exhibited higher alkaline stability than that of a quaternary ammonium cation, benzyltrimethyl-ammonium ([BTMA]⁺), in CD₃OD/D₂O NaOH solution at elevated temperatures. This observation inspired the preparation of [DMIIm]⁺-based alkaline anion exchange membranes (AEMs) which showed high alkaline stability in alkaline solution.