Volumetric and viscometric studies on N,N-dimethylacatamide + 1-hexanol/1-heptanol binary liquid mixtures at different temperatures

Densities rho, and viscosities eta, have been measured for pure N,N-dimethylacetamide (DMA), 1-hexanol, 1-heptanol and for their 18 binary mixtures with DMA as a common component, covering the entire composition range, at 25, 30, 35, 40 and 45DGC. Using the experimental values of rho and eta, the excess molar volume VE, excess viscosity etaE, excess rheochore [RE], excess partial molar volume V2DGE, of alkanols in DMA at infinite dilution and excess free energy of activation of viscous flow DeltaG*E, have been calculated. The dependence of these excess functions on composition and temperature has been discussed from the point of view of inter-molecular interactions in these mixtures. Furthermore, from the temperature dependence of viscosity, the enthalpy DeltaH*, and entropy DeltaS*, of activation of viscous flow have also been calculated and their dependence on composition have been discussed.