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- Reiter, Manuel, et al.
(author)
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Tuning the glass transition of siloxane-based poly(ionic liquid)s towards high ion conductivity
- 2021
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In: Journal of Polymer Science. - : Wiley. - 2642-4150 .- 2642-4169. ; 59:14, s. 1518-1527
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Journal article (peer-reviewed)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.
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