Thermodynamic properties of n-alkoxyethanols plus organic solvent mixtures- XIII. Application of the Flory theory to 2-methoxyethanol plus n-alkoxyethanols systems

The Flory theory has been applied to the following binary mixtures: 2-metho xyethanol (2ME) + 2-ethoxyethanol (2EE), or + 2-butoxyethanol (2BE), and 2-(2-methoxyethoxy)ethanol (22MEE), $2-(2-ethoxyethoxy)ethanol (22EEE), or + 2-(2-buthoxyethoxy)ethanol (22BEE). For pure compounds, the coefficients of thermal expansion cc and jsothermal compressibility K-T were estimated in order to compute the Flory character istic parameters, pressure p(i)* and volume v(i) *. For each mixture, the energetic parameter chi (12) was fitted to excess ent halpy data H-E at 298.15 K and used to predict correctly the corresponding excess volume VE. The variation of chi (12) versus the numberof C atoms + - O- groups in alkoxyethanols is similar to that found previously for 1-alkan ol $ 1-alkanol mixtures. (C) 2000 Elsevier Science B.V. All rights reserved .