Study on the interactions between SDBS/SOE-60 mixed surfactant and PVP in solution

The interactions between the mixed surfactants sodium dodecyl benzenesulfonate (SDBS) and modified oil ethoxylate (SOE-60) with polyvinylpyrrolidone (PVP) were studied at 25 ± 1 °C using a surface tension meter, Ubbelohde viscometer, and fluorescence spectrophotometer. Interaction mechanisms of SDBS/SOE-60-PVP systems were explained by the “necklace and bead” model. The results showed that the interaction could be divided into three parts by two characteristic concentrations: the critical aggregation concentration (cac) and the polymer saturation point (psp). The interaction mechanisms of SDBS/SOE-60-PVP systems are consistent with the “necklace and bead” model. The binding mixing surfactant micelles, formed by free SDBS and SOE-60 molecules, were bound to PVP chains by hydrophobic and ion–dipole interactions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46717.