Volumetric, compressibility and viscosity studies of binary mixtures of [EMIM][NTf2] with ethylacetate/methanol at (298.15-323.15) K

Densities, speeds of sound and viscosities of pure and binary mixtures 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide([EMIM][NTf2]) + ethyl acetate/methanol have been measured experimentally over the entire composition range and at six temperatures from 298.15 K to 323.15 K, at pressure 0.1 MPa using Anton Paar Density and Sound velocity meter DSA 5000 M and, Lovis microviscometer 2000 M. From these experimental data, the excess molar volumes (VE), viscosity deviations (∆η) and isentropic compressibility deviations (∆κs) have been evaluated. The VE values are negative for [EMIM][NTf2] + ethyl acetate system upto x1 = 0.90 and positive above this x1 value at all temperatures of study. However, the VE values are negative for [EMIM][NTf2] + methanol system at entire mole fraction range and at all temperatures. The VE values in both studied systems decrease with increase in temperature. The ∆η and ∆κs are found to be negative over the entire range of mole fraction and decrease with increasing temperature in both binary systems. The computed data of VE, ∆η and ∆κs have been correlated with Redlich-Kister polynomial equation. The measured and computed data have been interpreted in terms of ion-dipole, ion-ion and dipole-dipole interactions and structural effects between like and unlike molecules upon mixing. The experimental data of VE have also been used to examine the applicability of Prigogine-Flory-Patterson (PFP) theory in predicting the VE of the binary mixtures. The minimum and maximum percent deviations of experimental and calculated by PFP VE values are 0.017 and 3.01 for [EMIM][NTf2] + ethyl acetate and 1.19 and 2.10 for [EMIM][NTf2] + methanol systems, respectively.