Viscoelasticity and poroelasticity in elastomeric gels

Yuhang Hu, Zhigang Suo

Research output: Contribution to journalArticlepeer-review

Abstract

An elastomeric gel is a mixture of a polymer network and a solvent. In response to changes in mechanical forces and in the chemical potential of the solvent in the environment, the gel evolves by two concurrent molecular processes: the conformational change of the network, and the migration of the solvent. The two processes result in viscoelasticity and poroelasticity, and are characterized by two material-specific properties: the time of viscoelastic relaxation and the effective diffusivity of the solvent through the network. The two properties define a material-specific length. The material-specific time and length enable us to discuss macroscopic observations made over different lengths and times, and identify limiting conditions in which viscoelastic and poroelastic relaxations have either completed or yet started. We formulate a model of homogeneous deformation, and use several examples to illustrate viscoelasticity-limited solvent migration, where the migration of the solvent is pronounced, but the size of the gel is so small that the rate of change is limited by viscoelasticity. We further describe a theory that evolves a gel through inhomogeneous states. Both infinitesimal and finite deformation are considered.

Original languageEnglish (US)
Pages (from-to)441-458
Number of pages18
JournalActa Mechanica Solida Sinica
Volume25
Issue number5
DOIs
StatePublished - Oct 2012

Keywords

  • creep
  • elastomer
  • gel
  • poroelasticity
  • stress relaxation
  • viscoelasticity

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering

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