TY - JOUR
T1 - Modeling liquid absorption of highly cross-linked epoxy resins in aqueous electrolyte solutions
AU - Krenn, Patrick
AU - Zimmermann, Patrick
AU - Fischlschweiger, Michael
AU - Zeiner, Tim
PY - 2021/2/1
Y1 - 2021/2/1
N2 - 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.
AB - 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.
KW - Electrolytes
KW - Maxwell-Stefan Diffusion
KW - PC-SAFT
KW - Polymer Thermodynamics
KW - Swelling
UR - http://www.scopus.com/inward/record.url?scp=85095678442&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2020.112881
DO - 10.1016/j.fluid.2020.112881
M3 - Article
AN - SCOPUS:85095678442
SN - 0378-3812
VL - 529
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
M1 - 112881
ER -