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

Jelena Vuksanović, Danijela Soldatović, Ivona Radović, Zoran Višak, Mirjana Kijevčanin*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)393-403
Number of pages11
JournalJournal of Chemical Thermodynamics
Volume131
Early online date26 Nov 2018
DOIs
Publication statusPublished - 1 Apr 2019

Bibliographical note

© 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Density
  • Excess Gibbs free energy of activation of viscous flow
  • Refractive index
  • Viscosity
  • Viscosity modeling

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