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Int. J. Mol. Sci. 2011, 12(4), 2598-2617; doi:10.3390/ijms12042598

Article

Effect of Temperature on the Physico-Chemical Properties of a Room Temperature Ionic Liquid (1-Methyl-3-pentylimidazolium Hexafluorophosphate) with Polyethylene Glycol Oligomer

Tzi-Yi Wu ^1,2 , Bor-Kuan Chen ^1,* , Lin Hao ¹ , Yu-Chun Peng ¹  and I-Wen Sun ²

¹ Department of Materials Engineering, Kun Shan University, Tainan 71003, Taiwan ² Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan

* Author to whom correspondence should be addressed.

Received: 30 March 2011; in revised form: 7 April 2011 / Accepted: 7 April 2011 / Published: 18 April 2011

(This article belongs to the Section Material Sciences and Nanotechnology)

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Abstract: A systematic study of the effect of composition on the thermo-physical properties of the binary mixtures of 1-methyl-3-pentyl imidazolium hexafluorophosphate [MPI][PF₆] with poly(ethylene glycol) (PEG) [M_w = 400] is presented. The excess molar volume, refractive index deviation, viscosity deviation, and surface tension deviation values were calculated from these experimental density, ρ, refractive index, n, viscosity, η, and surface tension, γ, over the whole concentration range, respectively. The excess molar volumes are negative and continue to become increasingly negative with increasing temperature; whereas the viscosity and surface tension deviation are negative and become less negative with increasing temperature. The surface thermodynamic functions, such as surface entropy, enthalpy, as well as standard molar entropy, Parachor, and molar enthalpy of vaporization for pure ionic liquid, have been derived from the temperature dependence of the surface tension values.

Keywords: ionic liquids; density; viscosity; refractive index; excess molar volume; surface tension

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