Fluorescence techniques are used to characterize the diffusion of pyrene into several naphthalene-labeled diblock copolymer micelles as a function of pH. The capture of pyrene by the micelles is composed of a fast and a slow process, as shown by intensity and spectral changes in pyrene fluorescence observed when a solution containing pyrene is mixed with a solution containing labeled micelles. The most important pH effect was at low pH: The corona is collapsed. Sensitized pyrene fluorescence results are in accord with a model in which solubilization occurs within the micellar core. Equilibration time of the sensitized fluorescence suggests a pyrene diffusion constant on the order of 10 -16 cm 2 /s. Several anomalous photophysical features suggest that the micelle core may have a complex structure.POLYMERIC MICELLES have recently received considerable attention because of their potential usefulness in many areas as a matrix for controlled release and uptake of small molecules in aqueous and organic environments (1,2,4,5; for a review,
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