Excess molar volumes, viscosity deviations and ultrasonic speeds of sound of binary mixtures of 2-butanone with some alkoxyethanols and amines at 298.15 K

Abstract

Densities, viscosities and ultrasonic speeds were measured for the binary mixtures of 2-butanone (BU), + 2-methoxy ethanol (ME), + 2-ethoxy ethanol (EE), + 2-butoxy ethanol (BE), + isopropylamine (IPA), + cyclohexylamine (CHA) and + diethylamine (DEA) over the entire range of composition at 298.15 K. From the experimental values of density, viscosity and ultrasonic speed, excess molar volumes ( V E), viscosity deviations (Δ η) and deviations in isentropic compressibility (Δ K S) have been calculated. The excess or deviation properties were fitted to the Redlich–Kister polynomial equation to obtain their coefficients and standard deviations. To explore the nature of the interactions various thermodynamic parameters, e.g., intermolecular free length ( L f), specific acoustic impedance ( Z) etc. have also been derived from the density and ultrasonic speed data. McAllister's multibody interaction model along with the Heric–Brewer model has been used to correlate kinematic viscosities ( υ) of the binary mixtures. Also, the experimental values of density, viscosity and ultrasonic speeds of the mixtures at 298.15 K were fitted to a polynomial of the type: y = ∑ i = 0 3 a i x 1 i by the method of least-squares with each point weighed equally. The excess or deviation properties were found to be either negative or positive depending on the molecular interactions and the nature of liquid mixtures and have been discussed in terms of molecular interactions and structural changes.