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Complex macromolecular dynamics:: I. Estimation technique for time-resolved emission anisotropy ratio of chromophores incorporated into polymer chains |
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| Authors: | Chihiro Hashimoto Jean Lachaise Hideharu Ushiki |
| Institution: | a Laboratory of Molecular Dynamics and Complex Chemical Physics, Department of Environmental and Natural Resource Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8, Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan b Centre de Physique Moleculaire Optique et Hertzinne, UMR5798, Universite Bordeaux I, 351, Cours de la Liberation, 33405 Talence, France c Laboratoire de Thermodynamique Etats Metastables et de Physique Moleculaire, U.F.R. Sciences et Techniques, Universite de Pau, avenue de l'universite, 64000 Pau, France |
| Abstract: | Time-resolved fluorescence emission anisotropy ratios of carbazolyl groups incorporated into polystyrene chains in polyethyleneoxide(PEO)/1,2-dichloroethane mixtures have been measured by the single photon counting method. The fluorescence depolarization method is very excellent to clarify various dynamical modes of polymer chains, and many theoretical and experimental researches have so far been reported in the field of polymer chain dynamics. However there are few reports about the dynamics on the polymer side chain, because the dynamical mechanism of the polymer side chain is very complicated. In this report we tried to analyze the dynamical modes of the polymer side chains by the fluorescence depolarization method. Five dynamical modes of a polymer chain based on the Wöessner model were estimated by our original analytical technique `χ2-map method'. The value of each mode of a polymer side chain was discussed above the overlap concentration (C*) of PEO and the micro-environments were clarified in the vicinity of the chromophore attached to the polymer side chain. |
| Keywords: | Wö essner model Fluorescence depolarization C* |
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