Excess Enthalpies, Densities, Viscosities, and Refractive Indices of Binary Mixtures Involving Some Poly(glycols) + Diethyl Carbonate at 308.15 K

Densities, viscosities, refractive indices, and excess enthalpies have been measured at 308.15 K and at atmospheric pressure for poly(ethylene glycols) 200, 400, and 600 and poly(propylene glycols) 400, 725, and 2000 + diethyl carbonate over the whole composition range. Enthalpy values are all posit...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2004-07, Vol.49 (4), p.970-975
Main Authors: Comelli, Fabio, Ottani, Stefano
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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Summary:Densities, viscosities, refractive indices, and excess enthalpies have been measured at 308.15 K and at atmospheric pressure for poly(ethylene glycols) 200, 400, and 600 and poly(propylene glycols) 400, 725, and 2000 + diethyl carbonate over the whole composition range. Enthalpy values are all positive, while volumetric values are negative with the exception of the mixture containing poly(propylene glycol) 400, where an inversion of sign is observed. Viscosity deviations are negative for all mixtures. Viscosities and viscosity deviations display complex dependencies on the type of polymer and on its molecular mass. The experimental results were fitted to the Redlich−Kister polynomial. The results are qualitatively discussed in terms of molecular interactions.
ISSN:0021-9568
1520-5134
DOI:10.1021/je034274o