Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/5200
Title: Influence of the Alkyl Tail Lenght on the Anionic Surfactant-PVP interaction
Authors: A. M., Tedeschi
Busi, Elena 
Basosi, Riccardo 
L., Paduano
G., Derrico
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 ()shows that formation of surfactant-polymer clusters occurs. The correlation time (τC) of thenitroxide in the same systems shows that electrostatic repulsion among the clusters, formedon the PVP macromolecules, favors a broadening of the polymer coil and a stiffening of itschain. The average number of surfactant molecules participating in each cluster adsorbedonto the polymer, as determined by fluorescence quenching measurements, is much higherfor C12OS than for C10OS.
Description: 
18869
URI: http://hdl.handle.net/20.500.12779/5200
ISSN: 0095-9782
DOI: 10.1007/s10953-006-9041-1
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