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- W2024289423 abstract "We developed a simple time-dependent mean-field theory to describe the phase separation kinetics of either homopolymers or AB-diblock copolymers in supercritical (SC) fluids. The model, previously used to describe the phase behavior of AB-block copolymers under the assumption of strong solvent selectivity for just one copolymer chain, has been extended to study the kinetics of the phase separation process. Time resolved small angle x-ray scattering (TR–SAXS) measurements have been performed on different AB-diblock copolymers containing a perfluorinated chain and dissolved in SC–CO2. The data obtained over a wide range of pressure and temperature confirm our theoretical predictions. Particularly interesting is the presence of two relaxation frequencies for the homogeneous solution→spherical aggregate transition, where the two relaxation processes depend on the depth of the pressure jump and on temperature. The whole phenomenon could be explained as an initial SC solvent/polymer phase separation followed by a slow reorientation process to form spherical aggregates driven by the copolymer solvophilic moiety." @default.
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- W2024289423 date "2004-02-10" @default.
- W2024289423 modified "2023-09-27" @default.
- W2024289423 title "Pressure-induced formation of diblock copolymer “micelles” in supercritical fluids. A combined study by small angle scattering experiments and mean-field theory. II. Kinetics of the unimer–aggregate transition" @default.
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- W2024289423 doi "https://doi.org/10.1063/1.1640999" @default.
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