Thermodynamic characterization of binary mixtures of poly(propylene glycol) 425 with toluene and o-, m- and p-xylenes


Density ρ viscosity η and refractive index nD have been experimentally measured for four binary mixtures of poly(propylene glycol) of average molecular weight 425 + toluene/o-xylene/m-xylene/p-xylene over the temperature range T = (293.15–333.15) K with temperature step 5 K and at atmospheric pressure. From the experimental data excess molar volumes VE, deviations in refractive index ΔnD, viscosity deviations Δη and excess Gibbs free energy of activation of viscous flow ΔG*E were calculated and fitted with Redlich-Kister polynomial in order to analyze non-ideal behavior of the studied mixtures. From ΔG* values excess entropy ΔS*E and excess enthalpy of activation of viscous flow ΔH*E were also calculated. It was shown that specific weak, but numerous, attractive interactions and entropic effect, due to difference in size of the pure component molecules, are responsible for volumetric and viscosity behaviour of the studied systems. The viscosities of the studied systems were predicted with the UNIFAC-VISCO and ASOG-VISCO models and correlated with the McAllister equation.

Publication DOI:
Divisions: College of Engineering & Physical Sciences
Additional Information: © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Uncontrolled Keywords: Density,Excess Gibbs free energy of activation of viscous flow,Refractive index,Viscosity,Viscosity modeling,Atomic and Molecular Physics, and Optics,Materials Science(all),Physical and Theoretical Chemistry
Publication ISSN: 0021-9614
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.sci ... 7882?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2019-04-01
Published Online Date: 2018-11-26
Accepted Date: 2018-11-25
Authors: Vuksanović, Jelena
Soldatović, Danijela
Radović, Ivona
Višak, Zoran (ORCID Profile 0000-0003-0962-8710)
Kijevčanin, Mirjana

Export / Share Citation


Additional statistics for this record