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Density ( ρ ), speed of sound ( u ), viscosity ( n ) and refractive index ( n D) of binary liquid mixtures comprising of N-vinyl-2-pyrrolidinone + 1-butanol, + 1-pentanol, + 1- hexanol and + 1-heptanol are accurately measured over the entire range of mole fractions at different temperatures (293.15 to 313.15) K and atmospheric pressure. Utilising the basic experimental data, various excess thermodynamic functions such as excess molar volume ( V E), deviation in viscosity ( Δη ), deviation in the speed of sound ( Δu ), deviation in isentropic compressibility ( ΔK s,), deviation in refractive index ( Δn D )  and excess Gibbs-free energy of activation of viscous flow ( ΔG *E) were calculated. To estimate the binary coefficients and standard deviation between the calculated and experimental values, the excess values were fitted to the Redlich−Kister polynomial equation. The analysis of these functions depicts the existence of specific and non-specific interactions.

physics and chemistry of liquids

Densities, viscosities, speeds of sound and refractive indices for binary mixtures of N-Vinyl-2-pyrrolidinone with n-Alcohols (C 4 -C 7 ) at 293.15 to 313.15 K