Thermodynamic properties of binary liquid mixtures of diethylenetriamine with alcohols at different temperatures

Densities, rho, viscosities, eta, and speeds of sound, u, were measured for the binary liquid mixtures containing diethylenetriamine with 2-methyl-1-propanol, 2-propanol and 1-butanol at 293.15, 298.15, 303.15, 308.15 and 313.15K. From density and speed of sound data, excess molar volumes, V(M)(E) and deviations in isentropic compressibility. Delta K(S), and speed of sound, Delta u have been evaluated. Viscosity data were used to compute deviations in viscosity and excess Gibbs energy of activation of viscous flow Delta G(*E) at 298.15, 303.15 and 308.15 K. A Redlich-Kister type equation was applied to fit the excess molar volumes and deviations in isentropic compressibility, speed of sound and viscosity data. The viscosity data have been correlated with the equations of Grunberg-Nissan, Tamura-Kurata, Heric-Brewer and of Hind et al. All the binary systems of the present study have negative values of excess molar volumes and deviations in isentropic compressibility over whole composition range and at all temperatures which indicates strong interactions between the components of binary mixtures. (C) 2011 Elsevier B.V. All rights reserved.