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

International Journal of Molecular Sciences

Tzi-Yi Wu¹  Bor-Kuan Chen¹  Lin Hao¹  Yu-Chun Peng¹ 

[1] Department of Materials Engineering, Kun Shan University, Tainan 71003, Taiwan; E-Mails:

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

DOI  :  10.3390/ijms12042598

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.