3 years ago

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

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
Data on density, ρ, speed of sound, c, and refractive index, n D, 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 298.15K for the mixture with u =5. These data have been used to compute excess molar volumes, V m E, excess adiabatic compressibilities, κ S E, and excess speeds of sound c E. Negative V m E values indicate the existence of structural effects and interactions between unlike molecules. From molar excess enthalpies, H m E, 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 toH m E 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 P int V m (where P int is the internal pressure and V m 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.

Publisher URL: www.sciencedirect.com/science

DOI: S0167732217330167

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.