Densities and viscosities of triethylene glycol monomethyl ether plus water solutions in the temperature interval 25 degrees C 80 degrees C

The density and viscosity of aqueous solutins of triethylene glycol monomet hyl ether have been measured at five temperatures in the range 25 degrees C -80 degrees C throughout the whole concentration range. Excess volume and v iscosity deviation values were calculated and correlated as a function of c omposition. The results are compared with other data when these were availa ble. The derived excess molar volumes, viscosity deviations, apparent molar volumes, and partial molar volumes at infinite dilution and the Grunberg-N issan interaction energy constants are reported. The values obtained can be used to understand the nature and extent of the patterns of molecular aggr egation that exist in binary (water + organic) mixtures and their sensitivi ty to variations in compositions, temperature, and molecular structure. Kno wledge of the effect of temperature and composition on changes in the liqui d density and viscosity is required in the modeling of mass transfer, heat transfer, and fluid flow.