Viscoelastic sol-gel state of the chitosan and alginate solution mixture

Sung Ok Shon, Byung Chul Ji, Young A. Han, Dong Joon Park, Ik Su Kim, Jin Hyun Choi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The rheological behavior of chitosan/alginate solutions was investigated in relation to gelation and polyelectrolyte complex (PEC) formation. Before mixing, the chitosan and the alginate solutions were both homogeneous fluids. However, heterogeneity developed after mixing, accompanied by a serious increase of viscosity. To determine the sol-gel state of the solutions, the viscoelastic variables, such as the dynamic storage modulus (G′) and loss modulus (G″), the loss tangent, and the viscoelastic exponents for G′ and G″, were obtained. Depending on the concentration, the chitosan/alginate solutions revealed unexpected rheological behavior. At a polymer concentration of 1.0 wt %, the chitosan/alginate solution was in a viscoelastic gel state, whereas, at higher concentrations, viscoelastic sol properties were dominant. A viscoelastic gel state for the chitosan/alginate solution was induced based on the weak formation of fiber-shaped precipitates of a PEC at a low polymer concen tration.

Original languageEnglish
Pages (from-to)1408-1414
Number of pages7
JournalJournal of Applied Polymer Science
Volume104
Issue number3
DOIs
Publication statusPublished - 2007 May 5

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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