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The synthesis and characterization of pyrrolidinium cation based anion exchange membranes (AEMs) are reported. Pyrrolidinium cations with various N-substituents (including methyl, ethyl, butyl, octyl, isopropyl, 2-hydroxylethyl, benzyl, and cyclohexylmethyl groups) were synthesized and investigated with respect to their chemical stability in alkaline media. The influence of substitutions on alkaline stability of pyrrolidinium cations was investigated by quantitative 1 H nuclear magnetic resonance spectroscopy (NMR) and theoretical approaches. N, N -Ethylmethyl-substituted pyrrolidinium cation ([EMPy] + ) exhibited the highest alkaline stability in this study. The synthesized AEMs based on [EMPy] + show promising alkaline stability in strongly basic solution. The study of this work should provide a feasible way for improving the alkaline stability of pyrrolidinium cation based AEMs.
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Gu et al. (2014) studied this question.
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