Thermodynamic study of polyethylene-glycols in micellar solutions water+sodium dodecylsulfate |
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Authors: | C. Aucouturier G. Roux-Desgranges A. H. Roux |
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Affiliation: | (1) U.R.A. C.N.R.S. 434, Laboratoire de Thermodynamique et Génie Chimique, Université Blaise Pascal, 63177 Aubiére Cedex, France |
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Abstract: | Interactions of a series of polyethyleneglycols (PEG) in aqueous micellar solutions of sodium dodecylsulfate (SDS) were investigated through thermodynamic properties. Volumes, heat capacities and enthalpies of dilution were measured at 25°C. The resulting transfer properties of PEG are reflecting hydrophobic interactions which increase with the polymer length and the hydrophilic interactions occurring in the aqueous polar layer of the micelles. Typically heat capacities clearly evidence various structural changes taking place in the micellar solutions. |
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Keywords: | enthalpies heat capacities polyethyleneglycols sodium dodecylsulfate surfactant-polymer interactions volumes |
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