Glass transition behaviour of the quaternary ammonium type ionic liquid, {[DEME][I] + H2O} mixtures |
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Authors: | Yusuke Imai Hiroshi Abe Hitoshi Matsumoto Osamu Shimada Tomonori Hanasaki Yukihiro Yoshimura |
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Affiliation: | 1. Department of Materials Science and Engineering, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan;2. Department of Applied Chemistry, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan;3. Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan |
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Abstract: | By a simple DTA system, the glass transition temperatures of the quaternary ammonium type ionic liquid, {N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium iodide, [DEME][I] + H2O} mixtures after quick pre-cooling were measured as a function of water concentration (x mol% H2O). Results were compared with the previous results of {[DEME][BF4] + H2O} mixtures in which double glass transitions were observed in the water concentration region of (16.5 to 30.0) mol% H2O. Remarkably, we observed the double glass transition phenomenon in {[DEME][I] + H2O} mixtures too, but the two-Tgs regions lie towards the water-rich side of (77.5 to 85.0) mol% H2O. These clearly reflect the difference in the anionic effect between and I? on the water structure. The end of the glass-formation region of {[DEME][I] + H2O} mixtures is around x = 95.0 mol% H2O, and this is comparable to that of {[DEME][BF4] + H2O} mixtures (x = 96.0 mol% H2O). |
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