Synergistic Effects in Aqueous Solutions of Mixed Wormlike Micelles and Hydrophobically Modified Polymers

The linear and nonlinear rheological properties of a hydrophobically modified guar (hm-HPG) and a surfactant forming wormlike micelles, the erucyl bis(hydroxyethyl)methylammonium chloride, have been investigated in 0.4 M KCl aqueous solution. The comparison between the zero-shear viscosity behaviors...

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Bibliographic Details
Published in:Macromolecules 2005-06, Vol.38 (12), p.5271-5282
Main Authors: Couillet, Isabelle, Hughes, Trevor, Maitland, Geoffrey, Candau, Françoise
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
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Summary:The linear and nonlinear rheological properties of a hydrophobically modified guar (hm-HPG) and a surfactant forming wormlike micelles, the erucyl bis(hydroxyethyl)methylammonium chloride, have been investigated in 0.4 M KCl aqueous solution. The comparison between the zero-shear viscosity behaviors of the nonmodified guar and the hm-HPG shows a decrease of the intermolecular associations upon increasing the temperature. Significant synergistic effects were observed between the modified polymer and the wormlike micelles in a range of concentrations extending from 0.1 to 1 wt % and for temperatures up to 60 °C. The optimal synergy for the zero-shear viscosity is obtained for mixtures with an overall concentration ≈ 0.35 wt % and a surfactant/polymer ratio equal to 1/4 (w/w). The terminal time of the stress relaxation, the zero-shear viscosity as well as the viscosity at a shear rate of 100 s-1 and the lifetime of the associations show a maximum at this composition. The experimental observations suggest the formation of very efficient cross-links between the wormlike micelles and the polymer chains.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma0501592