Abstract
Novel ion-gels bearing lithium borate were synthesized via condensation between cellulose and boric acids in IL. Ion-gels obtained showed high ionic conductivity comparable to IL itself. First, ion-gels containing 5 wt % and 7 wt % of cellulose were prepared in 1-allyl-3-ethylimidazolium chloride. Their ionic conductivities were evaluated by ac-impedance method after drying ion-gels thoroughly. The ion-gel including 5 wt % of cellulose exhibited higher conductivity than that including 7 wt % of cellulose. This should be because of lower activating energy under lower composition of cellulose. The effect of concentration of C6F5B(OH)2 on ionic conductivity was also examined with varying the ratio of B(OH)3 and C6F5B(OH)2. It was demonstrated that the ion-gel including greater amount of pentafluorophenylborate showed significantly enhanced ionic conductivity. Preparation of ion-gels including 1-allyl-3-ethylimidazolium formate was also examined at the cellulose concentration of 7wt%. The ion-gels synthesized in 1-allyl-3-ethylimidazolium formate showed higher ionic conductivity (1.98 x 10-3 Scm-1; 30°C) than that synthesized in 1-allyl-3-ethylimidazolium chloride. This should be because of lower viscosity of 1-allyl-3-ethylimidazolium formate.
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Matsumi, N., Nakamura, Y., Aoi, K. et al. Enhanced Ionic Conduction in Organoboron Ion Gels Facilely Designed via Condensation of Cellulose with Boric Acids in Ionic Liquids. Polym J 41, 437–441 (2009). https://doi.org/10.1295/polymj.PJ2008289
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DOI: https://doi.org/10.1295/polymj.PJ2008289
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