Abstract
The interaction between micelles formed from sodium n-decylphosphate and poly(ethylene oxide) (PEO, mol wt 10,000 and 20,000), poly(propylene oxide) (PPO, mol wt 1000), and poly(vinyl methylether) (PVME, mol wt 27,000) has been studied as a function of the structural charge (Z 0 = 1.0–2.0) of the surfactant. To this end, CMC values have been measured in the absence and presence of polymer employing a method based on monitoring the change in pH upon micellization. The results are discussed in comparison with similar data for the interaction of sodium n-octylphosphate (Z 0 = 1.0), sodium n-decylsulfate (SDeS), sodium n-dodecylsulfate (SDS), and cetyltrimethylammonium bromide (CTAB) with the same polymers. Whereas SDeS micelles interact with PEO 10k, the interaction of sodium n-decylphosphate micelles with this polymer is negligible. n-Decylphosphate micelles do interact with PEO 20k as well as with PPO and PVME, but the interaction decreases upon increasing Z 0 from 1.0 to 2.0. We conclude that hydrophobic interactions and hydration shell overlap effects are important factors in the polymer-micelle complexation process.
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