Excess molar volumes and viscosities of binary mixtures of some polyethers with propylamine at 298.15 K

Excess molar volumes (V-m(E)) and dynamic viscosities (eta) have been measured as a function of composition for binary liquid mixtures of propylamine with 2,5-dioxahexane, 2,5,8-trioxanonane, 2,5,8,11-tetraoxadodecane, 3,6,9-trioxaundecane, and 5,8,11-trioxapentadecane at 298.15 K. The excess volumes are positive over the entire range of composition for the systems propylamine + 2,5-dioxahexane, and + 3,6,9-trioxaundecane, negative for the systems propylamine + 2,5,8,11-tetraoxadodecane, and + 5,8,11-trioxapentadecane, and change sign from positive to negative for the remaining system propylamine + 2,5,8-trioxanonane. From the experimental data, deviations in the viscosity (Deltaln eta) and excess energies of activation for viscous flow (DeltaG*(E)) have been derived. These values are positive for all mixtures with the exception of propylamine + 2,5-dioxahexane.