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Título : Thermodynamics of amide + ketone mixtures. 2. Volumetric, speed of sound and refractive index data for N,N-dimethylacetamide + 2-alkanone systems at several temperatures. Application of Flory's model to tertiary amide + n-alkanone systems
Autor : Cobos, Ana .
González, Juan Antonio .
Hevia, Fernando .
García de la Fuente, Isaías .
Alonso Tristán, Cristina
Publicado en: Journal of Molecular Liquids. 2017, V. 248, p. 286-301
Editorial : Elsevier
Fecha de publicación : dic-2017
Fecha de disponibilidad: ene-2020
ISSN : 0167-7322
Resumen : Data on density, ρ, speed of sound, c, and refractive index, nD, have been reported at (293–303.15) K for the N,N-dimethylacetamide (DMA) + CH3CO(CH2)u − 1CH3 (u = 1, 2, 3) systems, and at 298.15 K for the mixture with u = 5. These data have been used to compute excess molar volumes, VmE, excess adiabatic compressibilities, κSE, and excess speeds of sound cE. Negative VmE values indicate the existence of structural effects and interactions between unlike molecules. From molar excess enthalpies, HmE, available in the literature for N,N-dimethylformamide (DMF), or N-methylpyrrolidone (NMP) + n-alkanone systems, it is shown: (i) amide-ketone interactions are stronger in DMF systems than in those with NMP; (ii) they become weaker when u increases in mixtures with a given amide. Structural effects largely contribute toHmE and are more relevant in mixtures containing NMP. The application of the Flory's model reveals that the random mixing hypothesis is valid in large extent for DMF solutions, while NMP systems are characterized by rather strong orientational effects. From values of molar refraction and of the product PintVm (where Pint is the internal pressure and Vm the molar volume), it is concluded that dispersive interactions increase with u, or when DMF is replaced by DMA in mixtures with a fixed ketone.
Palabras clave: Amides
n-Alkanones
Thermophysical properties
Flory
Random mixing
Materia: Física
Physics
Licencia: http://creativecommons.org/licenses/by-nc-nd/4.0/
URI : http://hdl.handle.net/10259/4927
Versión del editor: https://doi.org/10.1016/j.molliq.2017.10.007
Aparece en las colecciones: Artículos SWIFT

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