Modeling swelling behavior of hydrogels in aqueous organic solvents

Md Rashedul Islam, Sheik Tanveer, Chau Chyun Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrogel, a three-dimensional elastic structure of cross-linked polymer chains, swells or deswells when immersed in aqueous organic solutions. The swelling of hydrogels depends on temperature, solvent composition, and hydrogel structure as the thermodynamic driving forces for hydrogel swelling are due to solvent – hydrogel interactions and expansion of elastic network. In this work, polymer Nonrandom Two-Liquid activity coefficient model is used to account for the solvent – hydrogel interactions and a semi-empirical expression for rubber elasticity is used to describe the expansion of elastic network. The model successfully correlates data for both swelling and equilibrium phase compositions for n-isopropyl acrylamide hydrogels in water – ethanol, water – acetone, water – n-butanol, and water – methyl isobutyl ketone mixed solvents.

Original languageEnglish
Article number116744
JournalChemical Engineering Science
Volume242
DOIs
StatePublished - Oct 12 2021

Keywords

  • Aqueous organic solvents
  • Hydrogel swelling
  • Polymer NRTL activity coefficient model
  • Swelling equilibrium composition

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