Abstract
Fluorescence measurements have been applied to the characterization of the nanoaggregates of poly(ethylene oxide)-b-polymethacrylate (PEO-b-PMA) copolymer with the cationic surfactant cetyltrimethylammonium chloride (CTAC). It was found that the formation of the aggregates is dependent on two factors: the concentration of the block copolymer and the degree of electric charge neutralization (DN) of the carboxylate anion with cationic CTAC. The critical aggregation concentration of the complex was determined at various levels of DN. The micropolarity of the nanoaggregates was investigated by vibronic fine structure of the monomer fluorescence of pyrene (so-called I1/I3 ratio). It was revealed that the micropolarity of the aggregate particles is close to that of acetic acid or ethyl acetate. The microviscosity of the aggregates was elucidated from excimer formation of pyrene and fluorescence polarization of rhodamine B. The interior of the aggregate particle is not rigid, so that the incorporated pyrene can...
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