Micellization of amphiphilic diblock copolymers: Corona shape and mean-field to scaling crossover

摘要: The aggregation behaviour of six amphiphilic poly(ethylene-propylene)-block-polyethylene oxide (PEP-PEO) copolymers in water was investigated with the aim to study systematically influence a growing soluble block on structural properties micelle. polymers were prepared such that they differ PEO content over large range molecular weights, while PEP size kept constant. micelles characterized by small-angle neutron scattering (SANS) involving contrast variation experiments. Data analysis performed spherical core/shell model either constant or radial decreasing density profile corona and core for both cases. main new result is we have observed coronal shape crossover from micelle homogeneous distribution low starlike hyperbolic high content. With respect number this corresponds mean-field scaling behavior