Abstract
The association behavior of random copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate (AMPS) and cholesteryl 6-methacryloyloxyhexanoate (Chol-C5-MA) in 0.1 M NaCl aqueous solutions was investigated by quasielastic light scattering and fluorescence techniques to gain further insights into the structures and properties of their “intermolecularly bridged flower-type micelles” which we had proposed previously. When the Chol-C5-MA content in the copolymer was as low as 1 mol %, unimers were found to coexist with the interpolymer aggregates independent of the polymer concentration (CP) in a range 0.1 < CP < 10 g/L. However, when the Chol-C5-MA content was increased to 5 mol %, virtually all the polymer chains form multipolymer aggregates which can be viewed as an assembly of flower-type micelles where polymer chains are “cross-linked” via Chol associations. The aggregation number of Chol moieties was estimated to be 17−19 for the copolymer of 5 mol % Chol-C5-MA by a time-resolved fluorescence quenchin...
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