Study of micelle formation by the diblock copolymer poly(styrene-b-dimethyl siloxane) in n-dodecane by small angle x-ray scattering |
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| Institution: | 1. Grupo de Fisicoquímica de Mezclas Líquidas, Department of Chemistry, University of Cordoba, Carrera 6ª # 77 – 305, Montería, Córdoba, Colombia;2. Relativistic Molecular Physics Group (ReMoPh), PhD program in Molecular Physical Chemistry, Facultad de Ciencias Exactas, Universidad Andres Bello, República 275, Santiago, Chile;3. Center of Applied Nanoscience (CANS), Facultad de Ciencias Exactas, Universidad Andres Bello, Av. República 330, Santiago, Chile;4. Departamento de Física, Facultad de Ciencias Básicas, University of Cordoba, Carrera 6ª # 77 – 305, Montería, Córdoba, Colombia;1. School of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran;2. School of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran |
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| Abstract: | The diblock copolymer poly(styrene-b-dimethyl siloxane) (PS-PDMS) in n-dodecane forms multimolecular micelles in which insoluble PS blocks associate in a core surrounded by a shell of solvated PDMS blocks. Small angle X-ray scattering data have been obtained for PS-PDMS concentrations in the range 0.5–10%. Intensity data have been interpreted by the Guinier method in order to determine the radius of the PS core of a micelle. Scattering intensities exhibit negative deviations from Porod's law, which is characteristic of a diffuse interfacial layer, permitting the determination of the thickness of the shell of solvated PDMS blocks. Scattering curves for solutions having high PS-PDMS concentrations have a peak maximum indicating ordered arrays of micelles. |
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