Mechanical behavior of temperature-sensitive gels under equilibrium and transient swelling

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Water uptake by a thermo-responsive gel is strongly affected by temperature: the gel swells below its volume phase transition temperature Tc and shrinks above Tc. Observations reveal two types of equilibrium swelling diagrams: discontinuous (with degree of swelling Q falling abruptly at Tc) and continuous (with Q decreasing smoothly with temperature). A constitutive model is developed for the mechanical behavior of a temperature-sensitive gel subjected to swelling that accounts for changes in its structure (phase separation) at Tc. Adjustable parameters are found by fitting experimental data in equilibrium swelling tests, transient deswelling–reswelling tests, and tensile-compressive tests on poly(N, N-diethylacrylamide) gel with a continuous equilibrium swelling curve and poly(N−n-propylacrylamide) gel with a discontinuous diagram. Numerical simulation demonstrates qualitatively different responses of gels with discontinuous and continuous swelling diagrams.

Original languageEnglish
Pages (from-to)79-100
Number of pages22
JournalInternational Journal of Engineering Science
Volume128
DOIs
StatePublished - 1 Jul 2018
Externally publishedYes

Keywords

  • Constitutive modeling
  • Hydrophobic association
  • Temperature-responsive gel
  • Volume phase transition

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