The 1,2-dimethoxyethane - water solvent system. Viscokinetic and thermodynamic properties of viscous flow from -10 to 80 °C

Kinematic viscosity (v) has been measured for pure 1,2-dimethoxyethane, and for nine of its binary mixtures with water, covering the whole miscibility field, and working at 19 temperatures in the -10 less than or equal to t/degrees C less than or equal to 80 range. The properties investigated have been fitted by some empirical equations of the type v=v(T) and v=v(X(1)). Starting from the experimental viscosities, the thermodynamic parameters (Delta G*, Delta H*, Delta S*) of the viscous flow in these binaries have been obtained by applying the Eyring approach and the standard thermodynamic equations. Furthermore, the excess functions, such as v(E) and Delta G(*E) have been evaluated, showing the existence of quite strong specific interactions between the components, probably via hydrogen bonding and a dipolar network. Experimental variations in the Delta G(*E) quantity with temperature were very useful in order to depict and differentiate the trend in three well defined composition regions, namely M(I), M(II), and M(III), which are probably characterized by different patterns in molecular aggregation between similar and/or non similar species.