Columnar nanostructured polymer films containing ionic liquids in supramolecular one-dimensional nanochannels |
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| Authors: | Akihiro Yamashita Masafumi Yoshio Seiya Shimizu Takahiro Ichikawa Hiroyuki Ohno Takashi Kato |
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| Affiliation: | 1. Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Hongo, Bunkyo-Ku, Tokyo, 113-8656 Japan;2. Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo, 184-8588 Japan |
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| Abstract: | Ionic liquids have attracted a considerable attention as the next generation electrolytes for energy devices. We have developed new free-standing and nanostructured polymer films in which ionic liquids are confined into one-dimensionally ordered nanochannels. These polymer films have been obtained by photopolymerization of hydrogen-bonded supramolecular columnar liquid-crystalline self-assemblies of an imidazolium-based ionic liquid and a wedge-shaped diol compound containing polymerizable groups. The macroscopically parallel alignment of the columnar structures on a glass substrate has been achieved by the application of mechanical shearing, and subsequently fixed into polymer films by UV irradiation. This ionic liquid-containing polymer film exhibits higher ionic conductivity than that of the previously reported one-dimensional polymer film obtained by in situ photopolymerization of a covalent-type columnar liquid-crystalline imidazolium salt. The noncovalent supramolecular approach to one-dimensionally ion-conductive polymer films has led to improvement on conductive properties. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 366–371 |
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| Keywords: | amphiphiles columnar liquid crystal orientation photopolymerization self-assembly supramolecular structures |
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