Abstract
The modification of sodium dodecyl sulfate (SDS) micelle dissolution-formation relaxation time tau2 (and relaxation amplitude) brought about by the addition of poly(ethylene oxides) (PEO) is investigated by using the temperature-jump technique with a spectroscopic probe (acridine orange). Whereas small molecular weight additives (dioxane, PEO 1000) have no special effect on these quantities, a very particular behavior is observed with PEO 10,000. It is shown that this behavior is in relation with the formation of the stoichiometric polymer-surfactant complex, which has been previously observed by means of different static methods. The influence of different parameters on tau2 is examined: polymer concentration, surfactant concentration, added salt concentration, temperature. The results are interpreted, with the aid of a mass action law model for polymer-surfactant complex formation, as supporting the idea that the complex is constituted of a micelle wrapped up by the polymer chain rather than by a polymer saturated by a linear adsorption of surfactant molecules. The observed features agree with the picture of a polymer-surfactant complex entity having between 0.5 and 1 chain of PEO 10,000 per micelle. 25 references, 9 figures.
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