Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

Densities n and speeds of sound u, for binary mixtures cyclohexylamine + cyclohexane and + benzene have been measured over the entire range of composition at temperatures from (293.15 to 323.15) K using an Anton-Paar DSA 5000. The molar isentropic compressibilities,Rao's molar sound functions R, thermal expansion coefficients aP, excess molar volumes Vm,E,and excess molar isentropic compressibilities Ks,m,E, have been calculated from these data. Vm,E and Ks,m,E for both the mixtures are positive at all temperatures and over entire range of compositions. The values for cyclohexylamine + cyclohexane increase with rise in temperature while decrease for cyclohexylamine + benzene. The values of (aVm,E/aTP) and aP,E are positive for cyclohexylamine + cyclohexane but negative for cyclohexylamine + benzene. Specific n-o interactions exist in later mixture. The results of u,Vm,E,aVm,E/aTP, and (aHm,E/aP)T are compared with the theoretical predictions of the Prigogine- Flory-Patterson theory.