Abstract
The rheological behavior of rodlike micelles in a 1,3-butanediol/water mixed solvent was investigated. The rodlike micelles were prepared by mixing sodium salicylate, with cetyltrimethylammonium bromide. When water was replaced by 1,3-butanediol, the viscosity maxima decreased drastically. The viscosity minimum, on the other hand, increased at low 1,3-butanediol contents and decreased again at higher amounts of 1,3-butanediol. As a result of the opposite changes the two maxima were replaced by a single maxima when the content of 1,3-butanediol was 15 %. The change in the viscosity was a consequence of a change in the structural relaxation times while the storage moduli remained constant. The stress relaxation was due to a reptation mechanism at maximum points while at the minimum of the viscosity the mechanism was due to a kinetic controlled mechanism.
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Acknowledgments
The author acknowledges Prof. Heinz Hoffmann for his useful notes and discussions. The faculty of science at King Faisal University is also acknowledged for encouraging the researchers.
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Abdel-Rahem, R.A. Influence of 1,3-Butanediol on the Viscoelasticity of Surfactant Solutions. J Surfact Deterg 17, 353–362 (2014). https://doi.org/10.1007/s11743-013-1475-z
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DOI: https://doi.org/10.1007/s11743-013-1475-z