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Micellar ionization degrees, from conductivity measurements, and micellar aggregation numbers, from steady-state quenching fluorescence of the sodium dodecyl sulfate/poly(propylene glycol) (SDS/PPG) (MW ) 425 and 1000) systems in aqueous solution, have been obtained. From the experimental results we conclude that small aggregates form on the polymer chain at a surfactant concentration c 1 smaller than the surfactant cmc. The aggregation numbers of these aggregates sharply increase with SDS concentration and, at a critical surfactant concentration (c2) higher than the SDS cmc, the aggregates become large enough to incorporate the polymer chains into the surfactant micelles, forming SDS/PPG mixed micelles in aqueous solution, that are similar to the cetyltrimethylammonium bromide (CTAB)/PPG and surfactant/ medium chain alcohols mixed micelles.

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