Excess volumes of cyclohexane + a linear ether at 298.15 K

Abstract

By means of a vibrating tube densimeter, the molar excess volumes, V E, at 298.15 K, have been determined in the whole mole fraction range, for binary mixtures of cyclohexane with a linear mono-, di-, or triether (diethyl, dipropyl, dibutyl, methyl butyl, ethyl butyl ethers, dimethoxymethane, diethoxymethane, 1,2-dimethoxyethane, 1,2-diethoxyethane, diethylene glycol dimethyl ether). Also, the limiting partial molal volumes have been evaluated from the high dilution data. The V E values are positive for all systems and increase with increasing the number of oxygen atoms in the ether molecule. There is a clear evidence for the effect of: (i) chain lengthening; (ii) position of the -O- group in the chain structure of monoethers; (iii) distance of two -O- atoms in diethers. The Flory theory of nonpolar solutions has been applied to some of the present mixtures. The sign, the magnitude, and the trend of V E with ether structure are correctly predicted.