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• W2973001938 endingPage "127052" @default.
• W2973001938 startingPage "127052" @default.
• W2973001938 abstract "In the polymer-surfactant system, increasing the concentration of surfactant leads to structural changes in surfactant micelles. This is expected to influence the polymer conformation in the dilute regime where polymer chains are singles and in the entangled regime where the polymer system is described by the blob concept. In this report, the effect of large Sodium bis(2-ethylhexyl) sulfosuccinate (AOT), surfactant concentrations on the conformation of two polyvinylpyrrolidone (PVP) molecular weight (Mw = 55000 g/mol and Mw = 360000 g/mol) was discussed. In the first part, in the dilute regime, CPVP≺C∗where polymer chains are considered isolated, the determination of PVP (Mw = 55000 g/mol and Mw = 360000 g/mol) intrinsic viscosity [η] showed a coil to globule transition with the increase of temperature. Electrical conductivity measurements have shown the morphological transition (sphere-cylinder) of surfactant micelles with the increase of surfactant concentrations. The addition of AOT wormlike micelles revealed the expansion of PVP chains for the two molecular weight. In the second part, in PVP entangled regime,CPVP≃16C∗ where overlapped polymer chains form molecular blobs, the addition of AOT wormlike micelles to PVP solutions doesn't affect the Newtonian behavior of PVP (Mw = 55000) and the pseudo-plastic behavior of PVP (Mw = 360000 g/mol). However, AOT surfactant reinforces significantly the dynamic viscosity of PVP,η for the two molecular weight. By fitting the PVP viscosity-temperature dependence with Fulcher-Tammann-Vogel law, the results showed that the more the surfactant is added, the stronger the PVP solution becomes, which proves that AOT cylindrical (wormlike) micelles presence enhances the solid character of PVP solutions." @default.
• W2973001938 created "2019-09-19" @default.
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• W2973001938 date "2020-01-01" @default.
• W2973001938 modified "2023-10-02" @default.
• W2973001938 title "A structural study of a polymer-surfactant system in dilute and entangled regime: Effect of high concentrations of surfactant and polymer molecular weight" @default.
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• W2973001938 doi "https://doi.org/10.1016/j.molstruc.2019.127052" @default.
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