Abstract
The method of synthesizing anionic amphiphilic protic hyperbranched ionic liquids with the controlled ratio between hydrophilic ionic-liquid groups and hydrophobic alkyl urethane fragments in the oligoester nucleus shell is developed. These compounds are synthesized by the interaction of excess hyperbranched polyesterpolyol containing 32 terminal hydroxyl groups with n-octadecyl isocynate followed by the acylation of hydroxyl groups by phthalic anhydride or 2-sulfobenzoic anhydride and the neutralization of the formed carboxyl or sulfonic groups by N-methylimidazole or 1,2,4-1H-triazole. With a rise in the content of alkyl urethane fragments, the synthesized compounds form the crystalline phase. Structuring of the system leads to different effects of the degree of ionicity of ionic-liquid groups on proton conductivity, which is within 10–7–10–4 S/cm at 100–120°C under anhydrous conditions. The thermal stability of the hyperbranched ionic liquids is determined by the nature of ionic-liquid groups and the amount of the introduced alkyl urethane fragments; it is in the range of 170–270°C.
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Original Russian Text © V.V. Shevchenko, A.V. Stryutsky, O.A. Sobko, V.F. Korolovich, N.S. Klimenko, M.A. Gumennaya, V.V. Klepko, Yu.V. Yakovlev, V.V. Davidenko, 2017, published in Vysokomolekulyarnye Soedineniya, Seriya B, 2017, Vol. 59, No. 4, pp. 243–256.
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Shevchenko, V.V., Stryutsky, A.V., Sobko, O.A. et al. Amphiphilic protic anionic oligomeric ionic liquids of hyperbranched structure. Polym. Sci. Ser. B 59, 379–391 (2017). https://doi.org/10.1134/S1560090417040108
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DOI: https://doi.org/10.1134/S1560090417040108