Experimental studies on volumetric and viscometric properties of binary and ternary mixtures of N,N-dimethylacetamide, N-methylformamide and propane-1,2-diol at different temperatures

Excess molar volumes V-m(E), and viscosity eta, of the ternary mixture of N,N-dimethylacetamide (1) + N-methylformamide (2) + propane-1,2-diol (3) and their binary mixtures were obtained from density rho, and viscosity eta, measurements over the entire mole fraction range at temperatures (293.15 to 333.15) K. Negative trend were observed for the V-m(E) values of the binary mixtures in the whole composition range except for N-methylformamide (2) + propane-1,2-diol (3) mixture in the N-methylformamide rich region. Also, negative V-m(E), values were observed for the ternary mixture except a few mole fractions in accordance with their binary mixtures. Effect of rising temperature on the trend of the V-m(E) values is not the same for the mixtures. The viscosity values of the mixtures over the entire mole fraction range decrease with increasing temperature. The results were interpreted based on the strength of specific interaction, size and shape of molecules. The experimental data of excess molar volumes were correlated with the Redlich-Kister and the Cibulka equations for the binary and ternary mixtures, respectively. (C) 2013 Elsevier B.V. All rights reserved.