Excess molar volumes and viscosities of binary liquid mixtures of (polyether + ester) systems at 298.15, 308.15, and 318.15 K

Excess molar volumes, VmE and viscosities (η) for the binary liquid mixtures of ((polyether+methyl) acetate (C3H6O2), ethyl acetate (C4H8O2), and propyl acetate (C5H10O2)) have been measured as a function of composition at the temperatures of 298.15, 308.15, and 318.15 K and atmospheric pressure over the full range of composition. The polyethers were 2,5,8-trioxanonane, and 2,5,8,11-tetraoxadodecane. From these results deviations of the viscosity, Δη from a mole fraction average, and excess free energies of activation of viscous flow, ΔG∗E have been calculated. The results for VmE, Δη, and ΔG∗E are discussed in terms of the molecular interactions between the components of the mixtures. Furthermore, activation enthalpies (ΔH∗) and entropies (ΔS∗) of viscous flow have been evaluated and their variation with concentration is discussed.