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] + H 2O} mixtures after quick pre-cooling were measured as a function of water concentration ( x mol% H 2O). Results were compared with the previous results of {[DEME][BF 4] + H 2O} mixtures in which double glass transitions were observed in the water concentration region of (16.5 to 30.0) mol% H 2O. Remarkably, we observed the double glass transition phenomenon in {[DEME][I] + H 2O} mixtures too, but the two- T gs regions lie towards the water-rich side of (77.5 to 85.0) mol% H 2O. These clearly reflect the difference in the anionic effect between BF 4 - and I − on the water structure. The end of the glass-formation region of {[DEME][I] + H 2O} mixtures is around x = 95.0 mol% H 2O, and this is comparable to that of {[DEME][BF 4] + H 2O} mixtures ( x = 96.0 mol% H 2O).
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