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Hydrophobic attraction of pyrene-end-labeled poly(ethylene glycol) in water and water-methanol mixtures
Cited 69 time in
Web of Science
Cited 66 time in Scopus
- Authors
- Issue Date
- 1987-08
- Publisher
- American Chemical Society
- Citation
- Macromolecules, 1987, 20, 1833
- Abstract
- Fluorescence stationary-state measurements of pyrene-end-labeled poly(ethy1ene glycols) (Py-PEG-Py) of three different molecular weights are presented. In aqueous solution the excimer to monomer intensity ratio, Ie/Im, in the intramolecular excimer region decreases as the polymer molecular weight is increased. For Py-PEG-Py of PEG weight-average molecular weight of 4800, the Ie/Im does not scale according to the Wilemski-Fixman theory based on a diffusion-controlled end-to-end cyclization process. Surprisingly, this Py-PEG-Py(4800) phase separates. We believe that these observations are due to a hydrophobic attraction between pyrene groups. The addition of methanol reduces the hydrophobic attraction by the preferential solvation of methanol molecules around the pyrene group.
- ISSN
- 0024-9297 (print)
1520-5835 (online)
- Language
- English
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