Strain dependence of the viscoelastic properties of alginate hydrogels

Rebecca E. Webber, Kenneth R Shull*

*Corresponding author for this work

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

Alginates, naturally derived linear copolymers of 1,4-linked β-D-mannuronic acid and α-L-guluronic acid residues, can form hydrogels in the presence of divalent cations. In this study alginate hydrogels were formed by the addition of Ca 2+ ions to aqueous solutions of sodium alginate. The Theological and mechanical behaviors of the hydrogels were studied using an axisymmetric probe tack apparatus with stress relaxation and cyclic movement capabilities. The hydrogels were subjected to high compressive strains (several units) to elucidate the source of nonelastic stress relaxation. These polysaccharide hydrogels behave elastically at small strains and become viscoelastic at large strains, a result that is responsible for the excellent toughness of the gels.

Original languageEnglish (US)
Pages (from-to)6153-6160
Number of pages8
JournalMacromolecules
Volume37
Issue number16
DOIs
StatePublished - Aug 10 2004

ASJC Scopus subject areas

  • Materials Chemistry

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