Abstract
AbstractSolution properties of an aqueous mixture of cholesterol‐bearing pullulan (CHP) and an ionic surfactant, sodium dodecyl sulfate (SDS) or dodecyltrimethylammonium chloride (DoTAC), were studied. The mixture forms gel or sol depending on the polymer‐surfactant composition. Because the unmodified pullulan/surfactant/water mixture does not show any gel formation at all over the composition range studied, the hydrophobic cholesterol moieties play an essential and important role in the gel formation. The phase behavior could be interpreted by formation of mixed micelles between cholesterol moieties of CHP and the surfactants. This was supported also by SAXS studies in the sol region. Rheological measurements of the gel showed that viscoelastic response of the CHP/SDS gel was controlled by at least two different processes with shorter and longer relaxation times. This was different from previously reported results for a system such as hydrophobically modified (hydroxyethyl)cellulose (HMHEC) and SDS.
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