VISCOSITY AND ULTRASONIC VELOCITY STUDIES OF BINARY-MIXTURES AT DIFFERENT TEMPERATURES .1. ACETONITRILE-PROPYLENE CARBONATE

Ultrasonic velocity, density and viscosity of binary mixtures of aceto nitrile (AN) and propylene carbonate (PC) are presented between 25 and 45-degrees-C. Adiabatic compressibility (K(s)), excess adiabatic comp ressibility K(s)E, excess viscosity (eta(E)) and excess volume (V(E)) are calculated. The activation energies for viscous flow for AN and PC interpreted by the activated rate process revealed relatively stronge r molecular association in PC. Excess functions while examined as a fu nction of mole fraction of PC (x(PC)) are found to be negative over th e whole composition range of AN-PC mixtures between 25 and 45-degrees- C. This has been taken to account for the strong dipole-dipole interac tions in An-PC mixtures.