Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Excess enthalpies and excess volumes of {x nonaflluorobutylmethylether + (1 - x) ethanol or methanol} were measured at T = 298.15 K. Excess enthalpies of both mixtures are positive and flatten in the middle mole fraction because of the concentration fluctuation approaching phase separation. Excess volumes were also large and flatten in the middle mole fraction. Partial molar enthalpies of ethanol or methanol are very large at infinite dilution in comparison with those of nonafluorobutylmethylether because of the breaking of hydrogen bonds of alcohol on mixing. The strong hydrogen bonds of methanol depresses the partial molar volume of methanol at infinite dilution. (C) 2002 Elsevier Science Ltd. All rights reserved.