Viscosities, speeds of sound and isentropic compressibilities for binary mixtures of 2-propoxyethanol with ethylene glycols

Abstract

Viscosity, at T = 293.15 K, 298.15 and 303.15 K, and speed of sound, at 298.15 K, have been measured for the binary mixtures of 2-propoxyethanol (PE) with diethylene glycol (DEG), triethylene glycol (TEG) and tetraethylene glycol (TETRAEG), over the entire composition range. The speeds of sound values were combined with those of our previous results of densities to obtain isentropic compressibilities( κ s ) and their excess counterparts( κ s E ). The experimental data were used to calculate the values of deviation of viscosity (Δ η) and speed of sound ( δu), and excess energy of activation for viscous flow (Δ G 12 * E ). These parameters, especially excess functions, are found to be quite sensitive toward the intermolecular interactions in the studied liquid mixtures. The excess and deviations of studied functions have been correlated using Redlich–Kister type polynomial equation by the method of least-squares for the estimation of the binary coefficients and the standard errors. The viscosity data were correlated with equations of Hind et al., Grunberg and Nissan, Frenkel, and McAllister.