HASHIMOTO, Chihiro; ROUCH, Jacques; LACHAISE, Jean; GRACIAA, Alain; USHIKI, Hideharu

doi:10.1016/j.eurpolymj.2004.04.002

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HASHIMOTO, Chihiro
Laboratory of Molecular Dynamics and Complex Chemical Physics

ROUCH, Jacques
Centre de physique moléculaire optique et hertzienne [CPMOH]

LACHAISE, Jean
Thermodynamique et Energétique des fluides complexes [TEFC]

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Ce document a été publié dans

European Polymer Journal. 2004-08, vol. 40, n° 8, p. 1997-2008

Elsevier

Résumé en anglais

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.< Réduire

Mots clés en anglais

Fluorescence depolarization

Wöessner model Engineering controlled terms: Anisotropy

Fluorescence

Macromolecules

Microstructure

Mixtures

Molecular dynamics

Photons

Polyethylene oxides Engineering uncontrolled terms: Fluorescence depolarization

Polymer chains

Vicinity Engineering main heading: Polystyrenes

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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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