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|Title:||Influence of the Alkyl Tail Lenght on the Anionic Surfactant-PVP interaction||Authors:||A. M., Tedeschi
|Keywords:||micellization; Polymer-surfactant interaction; electron paramagnetic resonance; spin-probe; fluorescence quenching||Issue Date:||2006||Project:||None||Journal:||JOURNAL OF SOLUTION CHEMISTRY||Abstract:||
The effect of the surfactant tail length on the interaction between sodium alkylsulfates(CnOS, n = 6, 8, 10, 12) and poly(vinylpyrrolidone) (PVP) in aqueous solutionhas been investigated by electron paramagnetic resonance (EPR) spectroscopy employingTEMPO-choline (TC) as a spin probe. Experimental evidence show that all of the consideredsurfactants molecularly interact with PVP. However, the cooperative behavior ofthe surfactant molecules when self-aggregating onto the polymer strongly increases withthe surfactant tail length. In fact, in the case of C6OS, the TC EPR parameters indicatethat surfactant monomers randomly associate with the polymer chain. In the case of C8OS,formation of surfactant-polymer clusters occurs simultaneously to free micellization. In thecase of C12OS and C10OS, the nitrogen isotropic hyperfine coupling constant of TC (
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