Abstract

It is shown that poly(ethylene oxide)/polystyrene block copolymer micelles in cyclopentane undergo remarkable increases in aggregation number, from 17 to 77 upon saturation with water, resulting in an increase in the hydrodynamic radius and in the radius of gyration. The second viral coefficient and the concentration dependence of the diffusion coefficient in these micelles reflect soft-sphere interactions. At low polymer concentrations, nonvirial changes in micellar size reflect further increases in aggregation number to the order of 100 chains/micelle. The results are interpreted in the context of a starlike micelle model

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