Abstract Cation-exchange membranes based on polystyrene block copolymer with phenylsulfonylimide ionogenic groups in the Na+-form show conductivities up to 0.2 mS cm−1 in organic amides such as N-methylpyrrolidone and N,N-dimemylacetamide. These values are 2–2.5 orders of magnitude higher compared to those of conventional sulfonated cation-exchange membranes. A strong dependence of solvation degree and ionic conductivity on dielectric permittivity, chemical structure, and composition of the solvent, as well as on the nature of the membrane functional group, was noted and discussed. Further, based on the dependence of membrane’s solvation on the dimethylacetamide or acetonitrile content in the water/organic solvent mixtures and thermodynamic properties of these solvent mixtures, the reasons for the difference in ionic conductivity with a variation in the composition of the solvent and the functional groups of membranes are described. It was shown that conductivity of the cation-exchange membranes can increase dramatically even at low water concentration in the acetonitrile solution. It was demonstrated that the membranes with phenylsulfonylimide groups have high ionic conductivity in water/dimethylacetamide mixtures of any concentrations, which opens new prospects for their applications in electrochemical desalination and metal-ion batteries.

中文翻译：

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具有磺酰亚胺基团的阳离子交换膜在水/有机酰胺混合体系中显示出高离子电导率

摘要 基于聚苯乙烯嵌段共聚物的阳离子交换膜具有 Na+ 形式的苯磺酰亚胺离子化基团，在有机酰胺（如 N-甲基吡咯烷酮和 N,N-二甲基乙酰胺）中显示出高达 0.2 mS cm-1 的电导率。与传统的磺化阳离子交换膜相比，这些值高出 2-2.5 个数量级。注意到并讨论了溶剂化程度和离子电导率对介电常数、化学结构和溶剂组成以及膜官能团性质的强烈依赖性。此外，基于膜的溶剂化对水/有机溶剂混合物中二甲基乙酰胺或乙腈含量的依赖性以及这些溶剂混合物的热力学性质，描述了离子电导率随溶剂组成和膜官能团变化而不同的原因。结果表明，即使在乙腈溶液中的低水浓度下，阳离子交换膜的电导率也能显着增加。结果表明，具有苯磺酰亚胺基团的膜在任何浓度的水/二甲基乙酰胺混合物中都具有高离子电导率，这为其在电化学脱盐和金属离子电池中的应用开辟了新的前景。