Density and volumetric properties of ethane-1,2-diol plus di-ethylen-glycol mixtures at different temperatures

The density of the ethane-1,2-diol (ED) + di-ethylen-glycol (DEG) binary mi xtures has been measured at different temperatures over the complete compos ition range. The experimental measurements have been used to check the vali dity of relationships accounting for the dependence of the density on tempe rature and composition, useful to obtain interpolated values in the corresp ondence of the experimented data gaps. Starting from the primary data, some derived quantities, such as partial mo lar volumes, excess and partial excess molar volumes, have been obtained. I n these mixtures, V-E presents an S-shaped dependence on composition at eac h temperature, showing negative values in the ED rich-region and positive v alues at the opposite extreme. The results are compared and discussed to ge t light to the: changes in molecular association and structural effects in this solvent system. (C) 2000 Elsevier Science B.V. All rights reserved.