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Journal of Thermodynamics
Volume 2012 (2012), Article ID 575728, 6 pages
Research Article

Glass Transition Behavior of the Quaternary Ammonium-Type Ionic Liquid: N,N-Diethyl-N-methyl-N-(2-methoxyethyl)ammonium Bromide-H2O Mixtures

1Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
2Department of Materials Science and Engineering, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
3Department of Applied Chemistry, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

Received 14 July 2011; Revised 22 August 2011; Accepted 23 August 2011

Academic Editor: Ramesh Gardas

Copyright © 2012 Yukihiro Yoshimura et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


By a simple differential thermal analysis (DTA) system, the concentration dependence of the glass transition temperatures (Tgs) for the quaternary ammonium-type ionic liquid, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bromide [DEME][Br] and H2O mixtures, after quick precooling was measured as a function of water concentration x (mol% H2O). We compared the results with the previous results of [DEME][I]-H2O and [DEME][BF4]-H2O mixtures in which a double-glass transition behavior was observed. Remarkably, the [DEME][Br]-H2O mixtures basically show one-Tg behavior and the Tg decreases monotonically with increasing H2O content up to around x=91.5. But it suddenly jumps to higher Tg value at a specific x=~92. At this very limited point, two Tgs (Tg1,Tg2) which we might consider as a transition state from the structure belonging to the Tg1 group to another one due to the Tg2 group were observed. These results clearly reflect the difference in the anionic effects among Br, I, and BF4-. The end of the glass-formation region of [DEME][Br]-H2O mixtures is around x=98.9 and moves to more water-rich region as compared to those of [DEME][BF4]-H2O (x=96.0) and [DEME][I]-H2O (x=95.0) mixtures.