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Density, Speed of Sound, and Refractive Index of Polyvinylpyrrolidone-K60 + N, N- Dimethylformamide / Dimethylacetamide Binary Mixtures at different Temperatures
1 , 1 , * 2
1  “Ilie Murgulescu” Institute of Physical Chemistry of Romanian Academy, Bucharest, Romania
2  National Institute for Chemical - Pharmaceutical Research and Development – ICCF Bucharest, Romania
Academic Editor: Julio A. Seijas (registering DOI)

Densities, speeds of sound, and refractive indices for the binary mixtures of Polyvinylpyrrolidone-K60 in N, N- Dimethylformamide, and in Dimethylacetamide solvents have been measured as a function of the different concentrations of the polymer at (298.15, 308.15, and 318.15) K temperatures. The thermo physical parameters such as the acoustic impedance, adiabatic compressibility, specific refraction, space-filling factor, and relaxation strength have been evaluated over the entire composition range the concentrations and temperatures based on the experimental data. The results are discussed and interpreted by comparison between the both studied systems.

Keywords: Polyvinylpyrrolidone-K60; polymer; N, N- Dimethylformamide; Dimethylacetamide; binary mixtures; densities; speeds of sound; refractive indices; thermo physical parameters