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Tuning the glass transition of siloxane-based poly(ionic liquid)s towards high ion conductivity |
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| Authors: | Manuel Reiter Arthur Markus Anton Jian Chang Friedrich Kremer Miriam M Unterlass Jiayin Yuan |
| Institution: | 1. Department of Materials and Environmental Chemistry (MMK), Stockholm University, Stockholm, Sweden
Institute of Applied Synthetic Chemistry, TU Wien, Vienna, Austria Institute of Materials Chemistry, TU Wien, Vienna, Austria;2. Peter Debye Institute for Soft Matter Physics, Leipzig University, Leipzig, Germany Department of Physics and Astronomy, The University of Sheffield, Sheffield, UK;3. Department of Materials and Environmental Chemistry (MMK), Stockholm University, Stockholm, Sweden;4. Peter Debye Institute for Soft Matter Physics, Leipzig University, Leipzig, Germany;5. Institute of Applied Synthetic Chemistry, TU Wien, Vienna, Austria |
| Abstract: | Herein, we report a simple and versatile synthetic approach towards siloxane-based poly(ionic liquid)s (PILs) with unusually low glass transition temperatures (Tg) down to ?73°C, and thus “liquid-like” behavior at room temperature. We designed a polydimethylsiloxane-derived copolymer carrying dialkylimidazolium moieties, and by careful selection of the side-chain length and the type of anions we were able to manipulate its Tg over a wide range and reach high ionic conductivities (σDC) up to 4.8 × 10?5 S/cm at 300 K. The ionized species make up only a minor fraction (<25 mol%) of the overall repeating units and are supposedly randomly distributed: Yet our results indicate dramatic effects on the thermal properties due to repulsive interactions between ionic and non-ionic segments. |
| Keywords: | conductivity glass transition temperature poly(ionic liquid) polysiloxane |