Hydrophobically cross-linked micellar solutions : microstructure and properties of the solutionsReportar como inadecuado




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Abstract : The aggregation behavior of the cross - linking agent dioleyl - polyethyleneoxide R -EO-x R, wiht x = 55, 90, 135 with and without the prescence of globular O - W microemulsion droplets was investigated. The microemulsion droplets consisted of tetradecyldimethylamine oxide TDMAO and decane and had a radius of about 33 Å. It was found that the cross-linking agent has a well defined cmc and forms micelles. The aggregation number was determined by light scattering measurements and lay in the range of 20 - 30. From SANS measurements somewhat higher aggregation numbers were obtained. Rheological measurements showed that the systems cross - link at high concentrations. The cross - linking agent was added to solutions tha contained microemulsion droplets. It was found that the viscosity of these solutions could become significantly enhanced upon its addition. SANS and light scattering data of these solutions showed that the size of the droplets did not change. The scattering data of the cross - linked micelles could be fitted with a model for hard spheres that included an additional attractive term. The shear moduli which were determined from the viscoelastic solutions are consistent with the scattering data.





Autor: M. Gradzielski A. Rauscher H. Hoffmann

Fuente: https://hal.archives-ouvertes.fr/



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