高分子-ドデシル硫酸ナトリウム間の吸着コンプレックスの可溶化能

概要

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Interactions between sodium dodecyl sulfate (SDS) and polymers including polyvinylpyrrolidone (PVP), polyacrylamide (PAA), polvinylalcohol (88% saponified, PVA), polyvinylacetate (PVAc) were studied by measuring the viscosity and the solubilization of an oil-soluble dye, Orange OT at 40°C. The viscosity of PVP was markedly raised by SDS addition and the solubilizing power of SDS was greatly increased by PVP, but PAA with similar polar group had very little effect both on viscosity and on solubilization; PVA and PVAc showed relatively little solubilization effect in spite of their much increased viscosity due to adsorption-complex formation.<BR>In SDS-PVP system, where the molar ratio of the two components was kept constant, the solubilization curve showed a linear relation with concentration above about CMC. This was interpreted by considering an equilibrium between free and adsorbed SDS molecules and assuming the linearity of the solubilizing power of the adsorption-complex with the concentration of the adsorbed SDS. In contrast with the reported Yellow OB solubilization, an internal CMC was observed and the solubilizing power of the complex to Orange OT was not so striking. These results were explained on the basis of the different solubilizing-sites for these dyes.
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