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The importance of the mixing energy in ionized superabsorbent polymer swelling models

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Show simple item record Fennell, Eanna Kamphus, Juliane Huyghe, Jacques M. 2020-03-13T10:44:48Z 2020-03-13T10:44:48Z 2020
dc.description peer-reviewed en_US
dc.description.abstract The Flory-Rehner theoretical description of the free energy in a hydrogel swelling model can be broken into two swelling components: the mixing energy and the ionic energy. Conventionally for ionized gels, the ionic energy is characterized as the main contributor to swelling and, therefore, the mixing energy is assumed negligible. However, this assumption is made at the equilibrium state and ignores the dynamics of gel swelling. Here, the influence of the mixing energy on swelling ionized gels is quantified through numerical simulations on sodium polyacrylate using a Mixed Hybrid Finite Element Method. For univalent and divalent solutions, at initial porosities greater than 0.90, the contribution of the mixing energy is negligible. However, at initial porosities less than 0.90, the total swelling pressure is significantly influenced by the mixing energy. Therefore, both ionic and mixing energies are required for the modeling of sodium polyacrylate ionized gel swelling. The numerical model results are in good agreement with the analytical solution as well as experimental swelling tests. en_US
dc.language.iso eng en_US
dc.publisher MDPI en_US
dc.relation.ispartofseries Polymers;12, 609
dc.subject ionized hydrogels en_US
dc.subject swelling en_US
dc.subject mixing energy en_US
dc.subject Flory–Rehner theory en_US
dc.subject finite deformation en_US
dc.subject Flory–Huggins equation en_US
dc.subject sodium polyacrylate en_US
dc.subject superabsorbent polymer en_US
dc.subject polymer mechanics en_US
dc.title The importance of the mixing energy in ionized superabsorbent polymer swelling models en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.3390/polym12030609
dc.contributor.sponsor IRC en_US
dc.contributor.sponsor Procter & Gamble Service GmbH, en_US
dc.relation.projectid EPSPG/2017/230 en_US
dc.rights.accessrights info:eu-repo/semantics/closedAccess en_US

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