Interaction of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide with methanol/dimethyl sulfoxide at (298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K: Measurements and correlations of thermophysical properties

Abstract

Densities, speeds of sound and viscosities of 1-butyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl)imide+methanol/dimethylsulfoxide mixtures have been measured experimentally over the entire composition range and at six temperatures, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15K, under 0.1MPa pressure using Anton Paar density and sound velocity meter DSA 5000M and Lovis microviscometer 2000M. From these experimental data, the excess molar volumes, VE, isentropic compressibility deviations, ∆κs and the viscosity deviations, ∆η have been evaluated. The computed data have been adequately fitted to the Redlich–Kister polynomial equation. The measured and computed data have been interpreted in terms of ion–dipole interactions and structural effects between like and unlike molecules upon mixing. The VE results have been correlated to the Prigogine–Flory–Patterson (PFP) theory. The experimental and PFP correlated values are quite close to each other.