Speeds of sound, isentropic compressibilities, viscosities and excess molar volumes of binary mixtures of methylcyclohexane + 2-alkanols or ethanol at T = 298.15 K

Speeds of sound u, isentropic compressibilities κS, viscosities η  , excess isentropic compressibilities κSE, excess molar volumes VmE, excess viscosities ηE, and excess Gibbs energy of activation ΔG∗ E of viscous flow have been investigated for seven binary mixtures of methylcyclohexane (MCH) with ethanol, 2-propanol, 2-butanol, 2-pentanol, 2-hexanol, 2-heptanol, and 2-octanol at 298.15 K. Excess properties were calculated therefrom and were correlated by Redlich–Kister type function in terms of mole fractions. For mixtures of MCH with used 2-alkanols, over the entire range of mole fractions, VmE is positive and both ηE and ΔG∗ E are negative. The κSE values are large and positive over the entire range of composition for mixtures of MCH with ethanol, 2-propanol, 2-butanol and for mixtures of MCH with 2-pentanol, 2-hexanol, 2-heptanol and 2-octanol change sign from positive in the 2-alkanol rich regions to negative in MCH rich regions. These results are consistent with the self-association of 2-alkanols and the nonpolar character of MCH, which produces the dissociation of the 2-alkanols. The viscosity, speeds of sound and isentropic compressibility data have been correlated with the various equations.