Local Chain Dynamics of Several Polymers in Θ Solvents Studied by the Fluorescence Depolarization Method

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  • Yamamoto Masahide
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Horinaka Jun-ichi
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Aoki Hiroyuki
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Tawa Keiko
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Ito Shinzaburo
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University

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  • Local Chain Dynamics of Several Polymer

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The relaxation times of local motion for five kinds of polymers: cis-polyisoprene (cis-PI), polystyrene (PS), poly (α-methylstyrene)(PαMS), syndiotactic-poly (methyl methacrylate) (s-PMMA), and poly (N-vinylcarbazole) (PVCz) were measured in the Θ solvents by the fluorescence depolarization technique. The viscosity reduced relaxation time Tm/η was in the following order with the activation energy in the same order: cis-PI < PS < PαMS < PVCz < s-PMMA. The relaxation time and the activation energy depend on whether the polymer is either mono-substituted or di-substituted, the bulkiness of the substituents, and also the stereoregularity. It was found that Tg, is closely correlated with the local chain mobility obtained in dilute solution.

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