Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Density, [rho], viscosity, [eta], and conductivity, [sigma], measurements of binary mixtures containing the pyrrolidinium nitrate Protic Ionic Liquid (PIL) and propylene carbonate (PC), are determined at the atmospheric pressure as a function of the temperature from (283.15 to 353.15) K and within the whole composition range. The temperature dependence of both the viscosity and conductivity of each mixture exhibits a non-Arrhenius behaviour, but is correctly fitted by using the Vogel.Tamman.Fulcher (VTF) equation. In each case, the best-fit parameters, such as the pseudo activation energy, E*a and ideal glass transition temperature, T0 are then extracted. The excess molar volumes VE, and viscosity deviations from the ideality, [delta][eta], of each investigated mixture were then deduced from the experimental results, as well as, their apparent molar volumes, V[phi], thermal expansion coefficients [alpha]p, and excess Gibbs free energies ([delta]G*E) of activation of viscous flow. The VE, [alpha]pE, [delta][eta] values are negative over the whole composition range for each studied temperature therein. According to the Walden rule, the ionicity of each mixture was then evaluated as a function of the temperature from (283.15 to 353.15) K and of the composition. Results have been then discussed in terms of molecular interactions and molecular structures in this binary mixture.