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• W2002057803 abstract "Two polymer−surfactant mixtures have been studied at the air−water interface using neutron reflectivity and surface tension techniques. For the noninteracting system poly(N-isopropylacrylamide) (PNIPAM)/octaethyleneglycol mono n-decyl ether (C10E8), the adsorption behavior is competitive and driven purely by surface pressure (Π). When Πpolymer > Πsurfactant, the surface layer consists of almost pure polymer, and for Πpolymer < Πsurfactant, the polymer is displaced from the surface by the increasing pressure of the surfactant. Beyond the CMC, the polymer is completely displaced from the surface. For the interacting system PNIPAM/sodium dodecyl sulfate (SDS) where the two species interact strongly in the bulk beyond the critical aggregation concentration (CAC), the surface behavior is more original. Earlier neutron reflectivity studies investigated PNIPAM adsorption behavior where the SDS was contrast-matched to the solvent. In the present study, complementary measurements of SDS adsorption where PNIPAM is contrast-matched to the solvent give a complete view of the surface composition of the mixed system. At a constant polymer concentration, with increasing SDS, three main regimes are obtained. For CSDS < CAC, adsorption is governed by simple competition and PNIPAM is predominant at the interface. At intermediate SDS concentration (CAC < CSDS < x2, where x2 indicates the predominance of free SDS micelles), interfacial behavior is governed by bulk polymer−surfactant interaction. Adsorbed polymer is displaced from the interface to form PNIPAM−SDS complex in the bulk. SDS adsorption remains weak since most of the SDS molecules are used to form bulk polymer−surfactant aggregates. Further increase in SDS concentration results in continued displacement of PNIPAM and an abrupt increase in SDS adsorption. This is a result of saturation of bulk polymer chain with adsorbed micelles. Interestingly, beyond x2, PNIPAM is not completely displaced from the surface. A mixed PNIPAM−SDS adsorbed layer with enhanced packing of the SDS monolayer is formed." @default.
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• W2002057803 date "2005-02-23" @default.
• W2002057803 modified "2023-10-14" @default.
• W2002057803 title "Noninteracting versus Interacting Poly(<i>N</i>-isopropylacrylamide)-Surfactant Mixtures at the Air−Water Interface" @default.
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• W2002057803 doi "https://doi.org/10.1021/jp0454265" @default.
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