A series of ionic liquids (ILs) are prepared by neutralizing tertiary amines with N,N‐bis(trifluoromethanesulfonyl)imide (HTFSI). As demonstrated by thermal and electrochemical characterizations, these ILs have very good temperature stability and a high ionic conductivity, that is, of the order of 10−2 S cm−1. By incorporating these ILs into a poly(vinylidenfluoride‐co‐hexafluoropropylene) polymer matrix, membranes with a high melting temperature, high decomposition point and with an ionic conductivity of about 10−2 S cm−1 at 140 °C, are obtained. These IL‐based, proton‐conducting membranes are proposed as new polymer electrolytes for high‐temperature polymer electrolyte membrane fuel cells (PEMFCs).

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1,3-Dibutylimidazolium bromide was soaked into a polymer network prepared by condensation of 4-4'-diaminoazobenzene, pyromellitic dianhydride and 1,3,5-tri(4-aminophenyl)benzene to form photoresponsive ion conductive gels.

Branched polyimide was synthesized by in situ polycondensation of 4,4′-oxydianiline, pyromellitic dianhydride, and 1,3,5-tri(4-aminophenyl)benzene in ionic liquid/zwitterion mixture. Compatibility between network and ionic liquids is important to keep gel shape and ionic conductivity. Only 6.0 wt % of polyimide was enough to keep gel state without phase separation or leakage. The obtained polyimide gel showed excellent thermal stability with decomposition temperature of above 300 °C, low glass-transition temperature, and stable ion conduction in a wide temperature range.

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