Solvent relaxation study of pH-dependent hydration of poly(oxyethylene) shells in
Jana Humpolícková1, Miroslav Stepánek, Karel Procházka
1Department of Physical and Macromolecular Chemistry and Laboratory of Specialty Polymers, School of Science, Charles University in Prague, Albertov 2030, 128 40 Prague 2, Czech Republic.
Abstract:
The hydration of the poly(oxyethylene) shell in polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylene) micelles was investigated by monitoring the solvent relaxation response of a solvent-sensitive fluorophore (patman). It has been found that the relaxation occurs on the nanosecond time scale. Results for triblock copolymer micelles have been compared with those obtained for polystyrene-block-poly(2-vinylpyridine) micelles in order to evaluate the effect of the outer polyoxyethylene layer. Considerable pH-dependent changes in the hydration of poly(oxyethylene) units at the poly(2-vinylpyridine)/polyoxyethylene interface were observed. Additionally, the paper shows that the solvent relaxation technique is a suitable tool for studying polymeric nanoparticles and that the measurement of time-dependent half-width of the emission spectrum allows for estimation of the extent of relaxation process observed by a given experimental setup.
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