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  • Title: Mechanism of molecular exchange in diblock copolymer micelles: hypersensitivity to core chain length.
    Author: Choi SH, Lodge TP, Bates FS.
    Journal: Phys Rev Lett; 2010 Jan 29; 104(4):047802. PubMed ID: 20366740.
    Abstract:
    Molecular exchange between spherical micelles formed from isotopically labeled diblock copolymers was investigated using time-resolved small-angle neutron scattering measurements. Temperature changes affect the micelle exchange rate R(t) consistent with melt dynamics for the core polymer. Varying the core block length N produces gigantic changes in R(t) due to the thermodynamic penalty associated with ejecting a core block into the surrounding solvent. This hypersensitivity, combined with modest polydispersity in N, leads to an approximately logarithmic R(t).
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