Journal of Chemical Thermodynamics, Vol.34, No.5, 593-611, 2002
Viscosity of (ethane-1,2-diol+1,2-dimethoxyethane plus water) at temperatures from 263.15 K to 353.15 K
The kinematic viscosity v for (ethane- 1,2-diol + 1,2-dimethoxyethane + water) was measured at 14 different ternary compositions covering the whole miscibility field, and at 19 temperatures in the range 263.15 less than or equal to T/K less than or equal to 353.15. The experimental values were fitted using empirical equations of the type nu = nu(T) and nu = nu(xi), respectively, in order to provide reliable models to account for the behaviour of the system. The excess kinematic viscosity nu(E) has been determined and interpreted in terms of the type and nature of the interactions among the components of the mixture. Using the experimental nu data, the thermodynamic properties (DeltaG*, DeltaH*, DeltaS*) of the viscous flow have been obtained from the Eyring's approach and standard thermodynamic equations. Furthermore, excess mixing functions, such as DeltaG*(E), have been determined, and found to evidence the existence of quite strong specific interactions among the components, probably due to the formation of hydrogen bonds and dipolar networks. However, all the calculated excess mixing properties suggest the absence of stable three-component adducts.
Keywords:kinematic viscosity;thermodynamics;fluidity;ternary mixtures;ethane-1,2-diol;1,2-dimethoxyethane;water