Excess molar volumes and viscosities of binary mixtures of propylene carbonate with (C5–C8) n-alkanols at 298.15 K

Abstract

Excess molar volumes (VE) and changes in viscosity (Δη) have been determined for binary liquid mixtures of propylene carbonate (PC) with (C5–C8) n-alkanols at 298.15 K and atmospheric pressure, over the whole composition range. The positive VE corresponding to negative Δη, for all the mixtures studied, suggests the presence of specific interactions, namely, involving the intermolecular hydrogen bonds. The results are correlated by means of a Redlich–Kister type equation. The fitting of viscosities to the parameter (N12) of Nissan–Grunberg or to the (H12) parameter of Hind et al. provides models for the dynamic viscosities; the two-parameter (v12 and v12) McAllister equation and the three parameters (a, b, and c) Heric–Brewer provide models for the kinematic viscosities, allowing us to gain greater knowledge of the interactions between unlike molecules. However, this analysis suggests that the McAllister model fits the data better than the others. Keywords: excess volumes, propylene carbonate, n-alkanols, liquid mixtures, hydrogen bonding.