Modeling liquid absorption of highly cross-linked epoxy resins in aqueous electrolyte solutions

Patrick Krenn, Patrick Zimmermann, Michael Fischlschweiger, Tim Zeiner*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The solvent absorption of an epoxy o-cresol novolac resin composite has been measured in different aqueous electrolyte solutions (NaCl, CaCl2 and MgCl2) at different salt concentrations from 0.1 to 0.3 mg/l. Next to the total solvent uptake, which was measured by a gravimetric measurement, the absorption of ions was determined by ion chromatography and by atomic absorption spectroscopy. The measured solvent absorption in equilibrium was calculated by combining the ePC-SAFT equation of state with a network term, which takes into account elastic forces in the polymer network counteracting a further solvent absorption. In order to model the solvent absorption kinetics, the equation of state was combined with a Maxwell-Stefan diffusion approach and the viscoelastic Kelvin-Voigt model for chain relaxation. The model parameters were only fitted to the absorption in pure water, what was only possible because the epoxy resin absorbed a neglectable amount of ions. The fully predictively calculated values for the absorption in electrolyte solutions are in qualitative agreement to the measured data.

Original languageEnglish
Article number112881
JournalFluid phase equilibria
Volume529
DOIs
Publication statusPublished - 1 Feb 2021
Externally publishedYes

Keywords

  • Electrolytes
  • Maxwell-Stefan Diffusion
  • PC-SAFT
  • Polymer Thermodynamics
  • Swelling

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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