Ionic conductivity and assembled structures of imidazolium salt-based block copolymers with thermoresponsive segments

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Abstract

Ionic liquid-based block copolymers composed of ionic (solubility tunable)-nonionic (water-soluble and thermoresponsive) segments were synthesized to explore the relationship between ionic conductivity and assembled structures. Three block copolymers, comprising poly(N-vinylimidazolium bromide) (poly(NVI-Br)) as a hydrophilic poly(ionic liquid) segment and thermoresponsive poly(N-isopropylacrylamide) (poly(NIPAM)), having different compositions, were initially prepared by RAFT polymerization. The anion-exchange reaction of the poly(NVI-Br) in the block copolymers with lithium bis(trifluoromethanesulfonyl)imide (LiNTf2) proceeded selectively to afford amphiphilic block copolymers composed of hydrophobic poly(NVI-NTf2) and hydrophilic poly(NIPAM). Resulting poly(NVI-NTf2)-b-poly(NIPAM) exhibited ionic conductivities greater than 10-3 S/cm at 90 °C and 10-4 S/cm at 25 °C, which can be tuned by the comonomer composition and addition of a molten salt. Temperature-dependent ionic conductivity and assembled structures of these block copolymers were investigated, in terms of the comonomer composition, nature of counter anion and sample preparation procedure.

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Nakabayashi, K., Sato, Y., Isawa, Y., Lo, C. T., & Mori, H. (2017). Ionic conductivity and assembled structures of imidazolium salt-based block copolymers with thermoresponsive segments. Polymers, 9(11). https://doi.org/10.3390/polym9110616

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