Polymer Chain Dynamics. II. Intermittent Process of Orientational Relaxation of Polystyrene Main Chain.

• Tsunomori Fumiaki

  Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology

• Ushiki Hideharu

  Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology

• Horie Kazuyuki

  Faculty of Engineering, The University of Tokyo

抄録

Polystyrene chains having an anthryl group in the middle of its back bone (PSAPS), whose degrees of polymerization are 3200, 2500, and 730, were used to detect orientational relaxation of polymer segments. In order to explain the power law behavior of fluorescence anisotropy decay curves of PSAPS chain, it was assumed that the orientational relaxation of segments is caused by the reaction between segments and solvent molecules. Further the distribution of interval time between relaxation phenomena was considered. According to above two assumptions, a hyperbolic function r(t)∼r₀(t⁄τ_eff)^−β have been derived as an orientational auto-correlation function. We propose the “intermittent process” of polymer segments as one of the probable description for the orientational relaxation process of polystyrene back bone. The hyperbolic exponent β is related to the characteristic activation energy E_a of a polymer segment. The value of E_a=7 kJ mol⁻¹ for polystyrene chain evaluated by β is in good agreement with hitherto reported values. Effective relaxation time τ_eff corresponds to the minimum reaction radii ξ₀ between a segment and a solvent molecule, i.e., the diffusivity of solvent molecules. Temperature dependence of ξ₀ is consistent with that of the reciprocal of solvent viscosity.

収録刊行物

• Polymer Journal

  Polymer Journal 28 (7), 582-587, 1996

  The Society of Polymer Science, Japan

キーワード

• Intermittent Process
• Polystyrene Main Chain
• Hyperbolic Function
• Fluorescence Depolarization
• Long Time Tail

詳細情報

• CRID: 1390001206290535168
• NII論文ID: 10006268206
• NII論文ID: 30001927430
• NII書誌ID: AA00777013
• DOI: 10.1295/polymj.28.582
• COI: 1:CAS:528:DyaK28XksVCrt7g%3D
• ISSN: 13490540
• ISSN: 00323896
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可