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    Interactions among Hydrophobically Modified Polyelectrolytes and Surfactants of the Same Charge

    Year: 2000

    Journal: Langmuir 2000, 16, 2609-2614, 20111221

    Authors: Lev Bromberg, Marina Temchenko, and Ralph H. Colby

    Organizations: Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802

    Effects of sodium dodecyl sulfate (SDS) on surface tension and rheology of aqueous solutions of an associative polymer, poly(ethyleneoxide)-b-poly(propylene oxide)-b-(poly(ethylene oxide))-g-poly(acrylic acid) (Pluronic-PAA) have been studied.SDSstarts to bind to the Pluronic-PAA copolymer at a concentration that is 25-fold lower than the critical micellization concentration (CMC) of the surfactant. The data indicate predominant binding between SDS and polyether segments of Pluronic-PAA. Incorporation of SDS into the Pluronic micelles makes the polymer less surface-active, as the surface tension increases. The Pluronic-PAA chains collapse when SDS binds, because the surfactant enhances hydrophobic intramolecular associations.