Volumetric, viscosimetric and acoustic studies of binary mixtures of 2-ethoxyethanol with 1-alkanols at 298.15 K

Abstract

Densities, viscosities and sound speeds of eight binary mixtures of 2-ethoxyethanol with methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol are determined over the entire range of mole fractions at 298.15 K. The excess molar volume (V E), viscosity deviations (Δη) and Gibbs excess free energy of activation for viscous flow (ΔG*E) have been investigated from these experimental density (ρ) and viscosity (η) values. The viscosity data have been correlated by Grunberg and Nissan, Tamura–Kurata and Hind correlation equation. The deviations in isentropic compressibility (ΔK S) were also calculated using the measured speeds of sound. The results are discussed and interpreted in terms of molecular package and specific interaction predominated by hydrogen bonding. The sound speeds were predicted by using free length and collision factor theoretical formulations, by Nomotto equation, by Vandeal Vangael ideal mixing relation and the impedance dependence relation. The deviations have been fitted to a Redlich–Kister equation and the results are discussed in terms of molecular interactions and structural effects. The excess properties are found to be either negative or positive depending on the molecular interactions and the nature of liquid mixtures.