Abstract
AbstractThe 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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