EXCESS MOLAR VOLUMES AND VISCOSITIES OF BINARY MIXTURES OF 2-BUTOXYETHANOL (BUTYL CELLOSOLVE) WITH CHLOROALKANES AT 298.15 K

摘要

Molar excess volumes (V-E) and dynamic viscosities (eta) have been measured for non-electrolyte mixtures of 2-butoxyethanol (butyl cellosolve) with dichloromethane, trichloromethane or tetrachloromethane at 298.15 K over the whole concentration range. The excess volume curves are sigmoid with a maximum in the chloroalkane-rich region. From the experimental data excess viscosities (Delta(E)ln eta)) and excess energies of activation for viscous flow (Delta G(*E)) have been derived. These values are positive over the entire range of composition for the system 2-butoxyethanol + trichloromethane and change sign from negative to positive for the remaining systems, 2-butoxyethanol + dichloromethane and + tetrachloromethane. The results for V-E, Delta(E)ln eta and Delta G(*E) are discussed in terms of the interaction between components. The Flory theory of mixtures provides a useful basis for a qualitative interpretation of the results. (C) 1997 Elsevier Science B.V. [References: 25]