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- W2063575101 abstract "Abstract The acid‐base equilibria of three anionic sulfonephthalein dyes, viz. , bromothymol blue (BTB), thymol blue (TB), and cresol red (CR), were studied spectroscopically in aqueous media containing the water‐soluble noninonic polymers polyvinyl alcohol (PVA) and polyethylene glycol (PEG) in the presence of an anionic surfactant, sodium dodecyl sulfate (SDS). A partition equilibrium method was used to determine the equilibrium constant of partition of the dyes between the micellar pseudo phase and aqueous phase in the presence of PVA and PEG. The critical aggregation concentrations (CAC) of the surfactants in buffered aqueous systems containing the neutral polymers were also determined. The CAC of the polymer‐surfactant systems were found to be lower than the critical micelle concentration of such systems in the absence of polymer, in otherwise identical conditions. The pH‐dependent association constants, K ass , of the sulfonephthalein dyes with the SDS‐PVA system increased with the increase in molecular weight of the polymer. The interactions of the dyes with the buffered aqueous SDS‐PVA and SDS‐PEG systems were found to be endothermic and entropy oriented. In the polymer domain, the head group region of the micelles was more exposed at lower concentrations of the polymer, but under excess polymer concentration they were increasingly shielded, which impaired their electrostatic interaction with the dyes." @default.
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- W2063575101 date "2006-03-01" @default.
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- W2063575101 title "Acid-base equilibria of sulfonephthalein dyes in aqueous polymer-surfactant media" @default.
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