RT info:eu-repo/semantics/article
T1 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
A1 Cobos, Ana .
A1 González López, Juan Antonio
A1 Hevia de los Mozos, Fernando
A1 García de la Fuente, Isaías
A1 Alonso Tristán, Cristina
K1 Amides
K1 n-Alkanones
K1 Thermophysical properties
K1 Flory
K1 Random mixing
K1 Física
K1 Physics
AB 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.
PB Elsevier
SN 0167-7322
YR 2017
FD 2017-12
LK http://hdl.handle.net/10259/4927
UL http://hdl.handle.net/10259/4927
LA eng
NO Junta de Castilla y León, under Project BU034U16
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024