Excess volumes, viscosities and compressibilities of binary mixtures consisting of alcohols with 1,4-dioxane at different temperatures

The densities, viscosities and ultrasonic velocities of binary mixtures of methanol (MeOH), butanol (BuOH) and isobutanol (iso-BuOH) with 1,4-dioxane (D) have been determined at 298.15, 303.15, 308.15 and 313.15K over the whole composition range using vibrating-tube densitymeter, Ubbelohde viscometer and ultrasonic interferometer respectively. These data have been utilized to estimate the excess volume (V-E), excess viscosity (eta (E)), excess compressibility (K-s(E)), excess Gibbs Free energy of activation of flow (G(E)) and Grunberg and Nissan parameter (d). Enthalpy (DeltaH*), entropy (DeltaS*) and free energy (DeltaG*) of activation of viscous flow have also been estimated using Eyring's equation from viscosity and density data. V-E values for MeOH-D system are negative at 298.15K over the entire composition range and at higher temperature, V-E plots become S shaped with V-E values positive at lower mole fraction of alcohol. V-E values are positive for BuOH-D and iso-BuOH-D systems over the entire composition range and for all the systems they increase with increase in temperature. eta (E) values are negative for all the systems and magnitude of eta (E) decreases with increase in temperature in ail the cases. K-s(E) values are negative for all the systems (except for BuOH-D system at 298.15K only) over the whole composition range. Analysis of these results suggests the absence of any strong specific interactions.