Tuning the glass transition of siloxane‐based poly(ionic liquid)s towards high ion conductivity

Abstract Herein, we report a simple and versatile synthetic approach towards siloxane‐based poly(ionic liquid)s (PILs) with unusually low glass transition temperatures ( T g ) down to −73°C, thus “liquid‐like” behavior at room temperature. We designed polydimethylsiloxane‐derived copolymer carrying dialkylimidazolium moieties, by careful selection of the side‐chain length type anions were able manipulate its over wide range reach high ionic conductivities (σ DC up 4.8 × 10 −5 S/cm 300 K. The ionized species make only minor fraction (<25 mol%) overall repeating units are supposedly randomly distributed: Yet our results indicate dramatic effects on thermal properties due repulsive interactions between non‐ionic segments.