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<p>The physicochemical properties of N,N-dimethylacetamide + methyl acrylate/ethyl acrylate/<i>n</i>-butyl acrylate binary mixtures are used to investigate the prevailing molecular interactions therein. The speeds of sound and viscosities of N,N-dimethylacetamide + methyl acrylate/ethyl acrylate/<i>n</i>-butyl acrylate binary mixtures are measured at 15&#xa0;mol fractions at temperatures from 288.15&#xa0;K to 318.15&#xa0;K and at pressure, <i>p</i> = 100&#xa0;kPa. Using the measured data, the excess isentropic compressibilities, excess speeds of sound, excess molar isentropic compressions and deviations in viscosity are calculated. The partial and excess partial molar isentropic compressions of the constituents at all mole fractions and at infinite dilution are computed. These properties are understood in terms of prevailing intermolecular interactions in these mixtures. The excess isentropic compressibility, excess molar isentropic compression, deviation in viscosity and excess partial molar isentropic compression exhibit negative values, and excess ultrasonic speeds exhibit positive values. These results specify the existence of dipole–dipole interactions among amide and alkyl acrylates molecules, and these interactions decrease with increase in size of the alkyl group of acrylate molecules in the order: methyl acrylate &gt; ethyl acrylate &gt; <i>n</i>-butyl acrylate. Further, the scaled particle theory is applied to theoretically estimate <i>u</i> values, and outcomes are compared with experimental data. Also, various empirical relations and models are applied to evaluate the viscosities, and the outcomes are equated to the experimental values. </p>

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Experimental and Theoretical Studies of Molecular Interactions Prevailing in N,N-Dimethylacetamide + Alkyl Acrylate Binary Mixtures using Acoustic and Viscometric Properties at Different Temperatures

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Anil Kumar Nain,
  • Dinesh Chand

摘要

The physicochemical properties of N,N-dimethylacetamide + methyl acrylate/ethyl acrylate/n-butyl acrylate binary mixtures are used to investigate the prevailing molecular interactions therein. The speeds of sound and viscosities of N,N-dimethylacetamide + methyl acrylate/ethyl acrylate/n-butyl acrylate binary mixtures are measured at 15 mol fractions at temperatures from 288.15 K to 318.15 K and at pressure, p = 100 kPa. Using the measured data, the excess isentropic compressibilities, excess speeds of sound, excess molar isentropic compressions and deviations in viscosity are calculated. The partial and excess partial molar isentropic compressions of the constituents at all mole fractions and at infinite dilution are computed. These properties are understood in terms of prevailing intermolecular interactions in these mixtures. The excess isentropic compressibility, excess molar isentropic compression, deviation in viscosity and excess partial molar isentropic compression exhibit negative values, and excess ultrasonic speeds exhibit positive values. These results specify the existence of dipole–dipole interactions among amide and alkyl acrylates molecules, and these interactions decrease with increase in size of the alkyl group of acrylate molecules in the order: methyl acrylate > ethyl acrylate > n-butyl acrylate. Further, the scaled particle theory is applied to theoretically estimate u values, and outcomes are compared with experimental data. Also, various empirical relations and models are applied to evaluate the viscosities, and the outcomes are equated to the experimental values.