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Time-resolved fluorescence anisotropy measurements on fluorescently tagged amphiphilic micelles (1994)

Procházka, K. ; Limpouchová, Z. ; Webber, S. E. ; [et al.]

Springer

Journal of fluorescence 4 (1994), S. 353-356

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ISSN: 1573-4994

Keywords: Time-resolved fluorescence anisotropy ; light scattering ; amphiphilic block copolymer micelles

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Block copolymers of polystyrene-block-poly)methacrylic acid) form multimolecular micelles in mixtures of 1,4-dioxane with a surplus of methanol at ambient temperatures. Micelles consist of compact polystyrene cores surrounded by outer shells formed by poly(methacrylic acid) and are in a reversible equilibrium with nonmicellized copolymer chains (unimers). A series of light scattering, ultracentrifugation, and fluorimetric measurements was performed on micellizing systems of end-tagged copolymers. Complex time-resolved fluorescence anisotropy decays may be explained by a distribution of fluorophores in two microenvironments, i.e., in compact polystyrene micellar cores and in unimer coils.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01881455

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Light scattering study of solubilization of organic molecules by block copolymer micelles in aqueous media (1995)

Tian, Minmin ; Arca, Emin ; Tuzar, Zdenek ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 1713-1722

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ISSN: 0887-6266

Keywords: block copolymers ; micelles ; solubilization ; light scattering ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Block copolymers, when dissolved in a selective solvent, form spherical micelles. These micelles can selectively solubilize organic molecules otherwise insoluble in the pure solvent. In this study, we report solubilization of organic molecules by styrene-methacrylic acid block copolymer micelles in aqueous buffers. A light scattering technique was developed to determine the extent of micellar solubilization. Our results indicate that the extent of micellar solubilization depends on the chemical nature of organic molecules, specifically, on the interactions between the organic compound and polystyrene. A thermodynamic model has been developed to describe micellar solubilization. The theoretical calculation agrees reasonably well with the experimental results for two micellar samples examined. ©1995 John Wiley & Sons, Inc.

Additional Material: 1 Ill.