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

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Yukihiro Yoshimura ◽  
Naohiro Hatano ◽  
Yusuke Imai ◽  
Hiroshi Abe ◽  
Osamu Shimada ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Glass Transition ◽  
Quaternary Ammonium ◽  
Water Concentration ◽  
Ammonium Bromide ◽  
Glass Formation Region ◽  
Rich Region ◽  
Formation Region ◽  
Transition Behavior ◽  
The Difference

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.

Thermal Properties of Bi2O3-B2O3-ZnO Glass System

2006 ◽  
Vol 510-511 ◽  
pp. 578-581 ◽  
Author(s):  
Yu Jin Kim ◽  
Seong Jin Hwang ◽  
Hyung Sun Kim
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Lead Oxide ◽  
Lead Free ◽  
Oxide Glasses ◽  
Glass Formation Region ◽  
Formation Region ◽  
Lower Glass Transition Temperature

Oxide glasses having lower glass transition temperature are widely used in electric devices. The oxide glasses usually contain lead oxide. Recently, lead oxide glasses have been replaced with lead-free oxide glasses because of the environmental pollution. We investigated the thermal properties and the glass formation region in the Bi2O3-B2O3-ZnO ternary system. The results showed that the ratio of Tg/Tl of the bismate glasses is around 0.55, which is lower than the value of ratio 0.67, the two-third rule (Tg/ Tl=2/3)

Glass transition behaviour of the quaternary ammonium type ionic liquid, {[DEME][I]+H2O} mixtures

2011 ◽  
Vol 43 (3) ◽  
pp. 319-322 ◽  
Author(s):  
Yusuke Imai ◽  
Hiroshi Abe ◽  
Hitoshi Matsumoto ◽  
Osamu Shimada ◽  
Tomonori Hanasaki ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Glass Transition ◽  
Quaternary Ammonium ◽  
Transition Behaviour

scholarly journals Low glass transition temperature poly(ionic liquid) prepared from a new quaternary ammonium cationic monomer

2015 ◽  
Vol 26 (7) ◽  
pp. 823-828 ◽  
Author(s):  
Hongkun He ◽  
Heesung Chung ◽  
Elliot Roth ◽  
David Luebke ◽  
David Hopkinson ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Quaternary Ammonium ◽  
Cationic Monomer ◽  
Poly Ionic Liquid

Investigation of CaSO4-KPO3-Na2B4O7 System as a Basis for Synthesis of Low-Melting Glasses Used as a Glass-Solder Material

2020 ◽  
Vol 989 ◽  
pp. 265-269 ◽  
Author(s):  
Alexey V. Stolbovsky ◽  
Svetlana Murzinova ◽  
Vita Vyatchina
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Softening Temperature ◽  
Glass Formation Region ◽  
Formation Region ◽  
Solder Material ◽  
Concentration Dependences

The possibility of using the compositions of CaSO4-KPO3-Na2B4O7 system as a glass-solder material is shown. A glass formation region has been established in ternary system. The concentration dependences of linear thermal expansion coefficient, the softening temperature and the glass transition temperature are determined and discussed.

scholarly journals Conformational Analysis of Quaternary Ammonium-Type Ionic Liquid Cation, N,N-Diethyl-N-methyl-N-(2-methoxyethyl) Ammonium Cation

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Takahiro Takekiyo ◽  
Yusuke Imai ◽  
Hiroshi Abe ◽  
Yukihiro Yoshimura
Keyword(s):  
Ionic Liquid ◽  
Dipole Moment ◽  
Gas Phase ◽  
Quaternary Ammonium ◽  
Density Functional ◽  
Ammonium Cation ◽  
Extended Form ◽  
Functional Theory ◽  
Partial Charges ◽  
The Difference

Conformational preference of N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium cation ([DEME]+), which is one of the quaternary ammonium-based ionic liquid cation, in the gas phase has been investigated using a density functional theory (DFT) calculation. Eight candidates for the stable conformers of [DEME]+ exist in the gas phase, and can it energetically classify into two groups. One is a five conformers group, which has the intramolecular attractive interaction form (the folded form). The other is a three conformers group, which is the noninteraction form (the extended form). The transformation from the folded form to the extended form induces large changes in the dipole moment and partial charges of N and O atoms. Here we show that the difference in the dipole moment and partial charges of N and O atoms associated with the conformational change of [DEME]+ are closely related to the molecular orientation of [DEME]-based ionic liquids in the liquid state.

A Novel Poly(Ionic Liquid) as the Thermal Insulating Material

2020 ◽  
Vol 13 (3) ◽  
pp. 241-247
Author(s):  
Wenxin Wei ◽  
Guifeng Ma ◽  
Hongtao Wang ◽  
Jun Li
Keyword(s):  
Thermal Conductivity ◽  
Ionic Liquid ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Flame Resistance ◽  
Insulating Material ◽  
Low Thermal Conductivity ◽  
Thermal Insulating ◽  
Poly Ionic Liquid

Objective: A new poly(ionic liquid)(PIL), poly(p-vinylbenzyltriphenylphosphine hexafluorophosphate) (P[VBTPP][PF6]), was synthesized by quaternization, anion exchange reaction, and free radical polymerization. Then a series of the PIL were synthesized at different conditions. Methods: The specific heat capacity, glass-transition temperature and melting temperature of the synthesized PILs were measured by differential scanning calorimeter. The thermal conductivities of the PILs were measured by the laser flash analysis method. Results: Results showed that, under optimized synthesis conditions, P[VBTPP][PF6] as the thermal insulator had a high glass-transition temperature of 210.1°C, high melting point of 421.6°C, and a low thermal conductivity of 0.0920 W m-1 K-1 at 40.0°C (it was 0.105 W m-1 K-1 even at 180.0°C). The foamed sample exhibited much low thermal conductivity λ=0.0340 W m-1 K-1 at room temperature, which was comparable to a commercial polyurethane thermal insulating material although the latter had a much lower density. Conclusion: In addition, mixing the P[VBTPP][PF6] sample into polypropylene could obviously increase the Oxygen Index, revealing its efficient flame resistance. Therefore, P[VBTPP][PF6] is a potential thermal insulating material.

Effect of Concentration on the Glass Transition and Viscoelastic Properties of Poly(methyl methacrylate)/Ionic Liquid Solutions

2011 ◽  
Vol 44 (4) ◽  
pp. 1016-1025 ◽  
Author(s):  
Michelle M. Mok ◽  
Xingcheng Liu ◽  
Zhifeng Bai ◽  
Yu Lei ◽  
Timothy P. Lodge
Keyword(s):  
Ionic Liquid ◽  
Glass Transition ◽  
Methyl Methacrylate ◽  
Viscoelastic Properties ◽  
Poly Methyl Methacrylate ◽  
Liquid Solutions
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