Investigations of the reduced Redlich–Kister equations for correlating excess properties of N,N-dimethylacetamide + 2-ethoxyethanol binary mixtures at temperatures from 298.15 K to 318.15 K

Abstract

Excess molar volumes, viscosity deviations and isentropic compressibility changes in N,N-dimethylacetamide + 2-ethoxyethanol binary mixtures at (298.15 K, 308.15 K and 318.15 K) were calculated from experimental density, viscosity and sound velocity data presented in previous work. Here these experimental values were used to test the applicability of the correlative reduced Redlich–Kister equation and the Herraez equation as well as their corresponding relative functions. These relative functions are important to reduce the effect of temperature and, consequently, to reveal the effects of different types of interactions. Limiting excess partial molar volume were deduced from different methods, activation parameters and partial molar Gibbs energy of activation of viscous flow against compositions were investigated. The results of these observations have been interpreted in terms of structural effects of the solvents. The correlating equation recently proposed by Belda, has also been applied to the present system in order to assess the validity of this equation.