Polymer Bulletin

, Volume 38, Issue 1, pp 71–79 | Cite as

Effect of surfactant concentration, pH, and shear rate on the rheological properties of aqueous systems of a hydrophobically modifed chitosan and its unmodified analogue

  • Anna-Lena Kjøniksen
  • Bo Nyström
  • Torgeir Nakken
  • Odd Palmgren
  • Terje Tande
Article
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Revised:
Accepted:

Summary

Oscillatory shear, shear relaxation and viscosity experiments have been carried out on semidilute solutions of chitosan and on a hydrophobically modified analogue (HM-chitosan) in 1 % acetic acid. This was done in the presence of various amounts of cetyltrimethylammonium bromide (CTAB) and at different pH values. All the rheological measurements on the HM-chitosan solutions revealed significant polymersurfactant interaction and pH effects. The observed rheological effects were least pronounced at pH≈4, while a strong viscoelastic response was found at pH values of 1 and 5 in HM-chitosan solutions of low surfactant concentration. At these conditions, significant shear-thinning effects were observed. In semidilute solutions of unmodified chitosan, the influence of pH, surfactant concentration and shear rate on the rheological properties was moderate or insignificant.

Keywords

Chitosan Shear Rate Surfactant Concentration Complex Viscosity CTAB Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Anna-Lena Kjøniksen
    • 1
  • Bo Nyström
    • 1
  • Torgeir Nakken
    • 2
  • Odd Palmgren
    • 2
  • Terje Tande
    • 2
  1. 1.Department of ChemistryUniversity of OsloOsloNorway
  2. 2.Department of Polymer and Surface ChemistryNorsk Hydro, Research Centre PorsgrunnPorsgrunnNorway

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