The influence of free IL structure and loading level in phosphonium-based poly(ionic liquid)/ionic liquid (PIL/IL) ion gel composite membranes was studied with regards to their ion conductivity and light gas separation performance. The resulting series of ion gels demonstrated ion conductivity values of 10^–7–10^–5 S/cm at 25 °C and 10^–5–10^–3 S/cm at 110 °C. It was found that shorter alkyl chain lengths on the phosphonium cation of the IL resulted in increased thermal stability of the ionic conductivity for the resulting PIL/IL membrane materials with negligible changes in ionic conductivity performance at temperatures up to 110 °C. Further, an increase of free IL loading resulted in an increase in overall ion conductivity and membrane mechanical stability. Similar structure/composition/function relationships were observed for the light gas separation performance of these phosphonium-based PIL/IL ion gel membranes. However, the resulting performance is lower than PIL/IL ion gel membranes based on imidazolium cations reported in the literature.

中文翻译：

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os基聚（离子液体）/离子液体离子凝胶膜：结构和离子液体负载对离子电导率和轻质气体分离性能的影响

研究了游离IL结构和载量对phospho类聚离子液体/离子液体（PIL / IL）离子凝胶复合膜的影响，从离子传导率和轻质气体分离性能两方面进行了研究。所得的一系列离子凝胶在25°C和10 ^–5 –10 ^{–3的条件下}显示出10 ^–7 –10 ^–5 S / cm的离子电导率值S / cm在110°C。已经发现，IL的phospho阳离子上较短的烷基链长度导致所得的PIL / IL膜材料的离子电导率的热稳定性提高，且在高达110℃的温度下离子电导率性能的变化可忽略不计。此外，自由IL负载的增加导致总离子传导率和膜机械稳定性的增加。对于这些基于磷鎓的PIL / IL离子凝胶膜的轻质气体分离性能，观察到了相似的结构/组成/功能关系。然而，所得性能低于文献中报道的基于咪唑阳离子的PIL / IL离子凝胶膜。