Abstract
The spatial distribution of bromine-labeled hydrophobic molecules—bromobenzene (BrBz) and 4-bromobenzylalcohol (BrBzOH)—incorporated in polymer micelles of poly(N,N-dimethylaminoethyl methacrylate)-block-poly(methyl methacrylate) (PDMAEMA-b-PMMA) was investigated using anomalous small-angle X-ray scattering (ASAXS) near the Br K-edge. ASAXS analyses revealed that BrBzOH was homogeneously dispersed in the hydrophobic PMMA core of the PDMAEMA-b-PMMA micelle, whereas BrBz was excluded from the vicinity of the core–shell interface of the PMMA core. The results indicate that the spatial distribution of hydrophobic molecules in polymer micelles strongly depend on the polarity of the encapsulated species.
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