• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1991 Fiscal Year Final Research Report Summary

Studies of Dilute Solution Properties of Oligomers and Polymers

Research Project

Project/Area Number 01430018
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 高分子物性
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

YAMAKAWA Hiromi  Kyoto Univ., Polymer Chem., Professor, 工学部, 教授 (80025874)

Co-Investigator(Kenkyū-buntansha) YOSHIZAKI Takenao  Kyoto Univ., Polymer Chem., Associate Professor, 工学部, 助教授 (90230705)
HAYASHI Hisao  Ryukoku Univ., Materials Chem., Associate Professor, 理工学部, 助教授 (10115917)
EINAGA Yoshiyuki  Kyoto Univ., Polymer Chem., Associate Professor, 工学部, 助教授 (70028257)
Project Period (FY) 1989 – 1991
KeywordsHelical Wormlike Chain / Oligomer / Mean-Square Radius of Gyration / Mean-Square Optical Anisotropy / Mean-Square Electric Dipole Moment / Scattering Function / Translational Diffusion Coefficient / Intrinsic Viscosity
Research Abstract

On the basis of the helical wormlike (HW) chain model, an experimental study was made of dilute solution properties of flexible polymers over a wide range of molecular weight M, including the oligomer region. Static properties such as the mean-squar13EA\ : e radius of gyratio, mean-square optical anisotropy, mean-square electric dipole moment, and scattering function were determined from light and small angle X-ray scattering and dielectric measurements, and steady-state transport coefficients, i.e., the translational diffusion coefficient and intrinsic viscosity from dynamic light scattering and viscosity measurements for atactic polystirene (a-PS), atactic poly(methyl methacrylate) (a-PMMA), polyisobutylene, and poly(dimethylsiloxane) (PDMS)13EA\ : . From comparisons of the dependences of the above properties on M with the respective HW theoretical predictions, the validity of the model was examined and effects of the stiffness and local conformation of polymer chains on those proper … More ties were clarified. A special care was taken of the stereochemical composition in the case of the asymmetric chains, i.e., a-PS and a-PMMA, and the values of the fraction of racemic diads of the samples for each polymer were confirmed to be the same indepe13EA\ : ndent of M.The main results obtained in this study are as follows.
1. All the present experimental results may be well explained by the corresponding HW theories, indicating the validity of the model.
2. The four basic HW model parameters have been determined unambiguously for each of the above four polymers.
3. On the basis of the model parameters thus determined, the following conclusions may be deduced. (1)The a-PMMA and PDMS chain contours retain large helical portions. (2)In contrast to the usual notion, the a-PMMA chain is stiffer than the a-PS cha13EA\ : in. (3)The PDMS chain is stiffer than usually considered. (4)The PDMS chain is very thin in the hydrodynamic sense.
4. The draining effect exists in the steady-state transport coefficients of PDMS, which may be regarded as arising from the facts 3-(3) and -(4) above.
5. The ratio of the hydrodynamic linear dimension of polymer chains determined from the steady-state transport coefficients to the static one determined from the mean-square radius of gyration is not a universal constant independent of polymer and s13EA\ : olvent. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Yoshinori Tamai,Toshiki Konishi,Yoshiyuki Einaga,Motoharu Fujii,and Hiromi Yamakawa: "Mean-Square Radius of Gyration of Oligo-and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 23. 4067-4075 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshiki Konishi,Takenao Yoshizaki,and Hiromi Yamakawa: "On the “Universal Constants"rho and PHI of Flexible Polymers" Macromolecules. 24. 5614-5622 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeshi Yamada,Hitoshi Koyama,Takenao Yoshizaki,Yoshiyuki Einaga,and Hiromi Yamakawa: "Transport Coefficients of Oligo-and Poly(dimethylsiloxane)s in Dilute Solutions.The Draining Effect" Macromolecules. 26. 2566-2574 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshio Takaeda,Takenao Yoshizaki,and Hiromi Yamakawa: "Mean-Square Optical Anisotropy of Oligo-and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 26. 3742-3749 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takenao Yoshizaki,Hisao Hayashi,and Hiromi Yamakawa: "Scattering Function of Oligo-and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 26. 4037-4044 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Katsuhisa Dehara,Takenao Yoshizaki,and Hiromi Yamakawa: "Translational Diffusion Coefficient of Oligo-and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 26. 5137-5142 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshinori Tamai, Toshiki Konishi, Yoshiyuki Einaga, Motoharu Fuji, and Hiromi yamakawa: "Mean-Square Radius of Gyration of Oligo- and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 23. 4067-4075 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshiki Konishi, Takenao Yoshizaki, and Hiromi Yamakawa: "On the "Universal Constants" rho and PHI of Flexible Polymers" Macromolecules. 24. 5614-5622 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeshi Yamada, Hitoshi Koyama, Takenao Yoshizaki, Yoshiyuki Einaga, and Hiromi Yamakawa: "Transport Coefficients of Oligo- and Poly(dimethylsiloxane)s in Dilute Solutions. The Draining Effect" Macromolecules. 26. 2566-2574 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshio Takaeda, Takenao Yoshizaki, and Hiromi Yamakawa: "Mean-Square Optical Anisotropy of Oligo- and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 26. 3742-3749 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takenao Yoshizaki, Hisao Hayashi, and Hiromi Yamakawa: "Scattering Function of Oligo- and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 26. 4037-4044 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Katsuhisa Dehara, Takenao Yoshizaki, and Hiromi Yamakawa and Hiromi Yamakawa: "Translational Diffusion coefficient of Oligo- and Poly(methyl methacrylate)s in Dilute Solutions" Macromolecules. 26. 5137-5142 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1995-03-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi