Structure–property relations for temperature-responsive gels

A. D. Drozdov, J. de Claville Christiansen

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A model is developed for equilibrium unconstrained swelling of thermo-responsive gels that takes into account formation of hydrophobic aggregates above the volume phase transition temperature (VPTT). The solid phase of a gel is treated as a polymer network with two types of junctions: covalent bonds that are formed under cross-linking polymerization of a pre-gel solution, and physical junctions that are developed due to aggregation of hydrophobic segments above VPTT. Adjustable parameters are found by fitting experimental data on poly(N-isopropylacrylamide) gels with various molar fractions of monomers and cross-linker and various routes of cross-linking (chemical reaction versus irradiation), furnished with sacrificial chains in pre-gel solutions, and synthesized under phase separation condition in mixed solvents. The ability of the model to describe equilibrium swelling diagrams is confirmed by numerical simulation.

Original languageEnglish
Pages (from-to)164-173
Number of pages10
JournalPolymer
Volume132
DOIs
StatePublished - 6 Dec 2017
Externally publishedYes

Keywords

  • Modeling
  • Swelling
  • Temperature-sensitive gel
  • Volume phase transition

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