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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
Año del Documento
2017
Editorial
Elsevier
Documento Fuente
Journal of Molecular Liquids, 2017, 248, 286-301
Resumen
Data on density, rho, speed of sound, c, and refractive index, nD, have been reported at (293–303.15) K for the N,Ndimethylacetamide (DMA) + CH3CO(CH2)_(u – 1)CH3 (u = 1, 2, 3) systems, and at 298.15 K for the mixture with u=5. These data have been used to compute excessmolar volumes, VmE, excess adiabatic compressibilities, kSE, 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 to HmE 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.
Materias (normalizadas)
Termodinámica
Materias Unesco
2213 Termodinámica
ISSN
0167-7322
Revisión por pares
SI
Patrocinador
Junta de Castilla y León Regional Grant BU034U16
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU14/04104
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU15/05456
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU14/04104
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU15/05456
Version del Editor
Idioma
spa
Tipo de versión
info:eu-repo/semantics/acceptedVersion
Derechos
openAccess
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