Insight into molecular interactions prevailing in N,N-dimethylformamide + alkyl acrylates mixtures at different temperatures: An experimental and theoretical investigation

Abstract

The excess isentropic compressibility, excess speed of sound, excess molar isentropic compressibility and deviation in viscosity were evaluated from the experimental values of speeds of sound and viscosities of N,N-dimethylformamide + methyl acrylate/ethyl acrylate/n-butyl acrylate binary mixtures over the entire composition range at temperatures (288.15–318.15) K and pressure (101 kPa). Further, the partial molar isentropic compressibility; excess partial molar isentropic compressibility of the components over the entire composition range and also at infinite dilution have been calculated. These evaluated parameters have been interpreted in relations to prevailing interactions in these mixtures. These interactions were found dependent on the size of alkyl group in acrylate molecules and the amide-acrylate interactions decline with increase in size of the alkyl group. Moreover, the speeds of sound for the mixtures were calculated by scaled particle theory and the results compared well with the experimental results. Also, the viscosities of these mixtures were correlated by means of various empirical relations and the results were found in good agreement with the experimental results.