Time-resolved fluorescence anisotropy measurements on fluorescently tagged amphiphilic micelles.
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.
Department of Physical and Macromolecular Chemistry, Charles University, Albertov 2030, 128 40, Prague 2, Czech Republic.
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Procházka
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Limpouchová
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Webber
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Munk