Densities, ultrasonic speeds, viscosities and excess properties of binary mixtures of methyl methacrylate with N,N-dimethylformamide and N,N-dimethylacetamide at different temperatures

The densities, rho, ultrasonic speeds, u and viscosities, eta of binary mixtures of methyl methacrylate (MMA) with N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMA), including those of pure liquids, over the entire composition range were measured at temperatures (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K and atmospheric pressure. From the experimental results, the excess molar volume, V-m(E), and excess isentropic compressibility, kappa(E)(s), excess isobaric coefficient of thermal expansion, alpha(E)(p) and excess molar isobaric expansion, E-p,m(E) were calculated. The excess partial molar volume, (V) over bar (E)(m,1) and (V) over bar (E)(m,2) and excess partial molar isentropic compressibility, (K) over bar (E)(s,m,1) and ($) over bar (E)(s,m,2) over the whole composition range; and partial molar volume, (V) over bar (m,1)degrees and (V) over bar (m,2)degrees, partial molar isentropic compressibility, (K) over bar (s,m,1)degrees and (K) over bar (s,m,2)degrees, excess partial molar volume, (V) over bar (m,1)degrees and (V) over bar (m,2)degrees, excess partial molar isentropic compressibility, (K) over bar (s,m,1)degrees(E) (K) over bar (s,m,2)degrees(E) at infinite dilution, and excess partial molar isobaric expansion, (E) over bar (E)(p,m,1) and (E) over bar (E)(p,m,2) over the whole composition range have also been calculated. The variations of these parameters with composition and temperature of the mixtures are discussed in terms of molecular interaction in these mixtures. It is observed that the MMA-DMF/DMA interactions in these mixtures follow the order: DMF < DMA. Further, the viscosities of these binary mixtures were correlated theoretically by using various empirical and semi-empirical models and the results were compared with the experimental findings. (C) 2013 Elsevier Ltd. All rights reserved.