Abstract
The fluorescence and fluorescence decay profiles of pyrene and 1-ethylpyrene in solutions of a hydrophobic alkali-swellable emulsion (HASE) polymer were examined to characterize the association structure formed from the hydrophobic substituents. The HASE polymer was obtained by the copolymerization of ethyl acrylate (EA), methacrylic acid, and a macromonomer containing a C20H41 group separated from the backbone by 32 ethylene oxide units. We examine solutions neutralized with 1 equiv of NaOH, at polymer concentrations where virtually all of the added probe is partitioned into hydrophobic domains of the polymer. Both monomer and excimer emission are observed, and IE/IM increases in proportion to the amount of probe added to the system. Individual monomer fluorescence decay profiles fit well to the traditional micelle Poisson quenching model, but attempts to calculate the hydrophobe aggregation number NR led to values that changed markedly with the ratio of probe to polymer. These results were rationalized ...
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