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Hydrophobic attraction of pyrene-end-labeled poly(ethylene glycol) in water and water-methanol mixtures
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Char, Kookheon | - |
dc.contributor.author | Frank, Curtis W. | - |
dc.contributor.author | Gast, Alice P. | - |
dc.contributor.author | Tang, Wing T. | - |
dc.date.accessioned | 2009-07-20T02:58:46Z | - |
dc.date.available | 2009-07-20T02:58:46Z | - |
dc.date.issued | 1987-08 | - |
dc.identifier.citation | Macromolecules, 1987, 20, 1833 | en |
dc.identifier.issn | 0024-9297 (print) | - |
dc.identifier.issn | 1520-5835 (online) | - |
dc.identifier.uri | https://hdl.handle.net/10371/5750 | - |
dc.description.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. | en |
dc.description.sponsorship | This work was initiated with support from the Center for Materials Research at Stanford University under the NSF-MRL Program. Additional support was provided by the Polymers Program of the National Science Foundation (DMR 84-07847) and the Army Research Office (DAAG 29-82-K-0019). | en |
dc.language.iso | en | - |
dc.publisher | American Chemical Society | en |
dc.title | Hydrophobic attraction of pyrene-end-labeled poly(ethylene glycol) in water and water-methanol mixtures | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 차국헌 | - |
dc.identifier.doi | 10.1021/ma00174a023 | - |
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