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

Dynamic Light Scattering Studies on Strong Interaction between Polymer Liquid Crystals and the Gelation Process.

Research Project

Project/Area Number 08651063
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 高分子構造・物性(含繊維)
Research InstitutionTohoku University

Principal Investigator

OIKAWA Hidetoshi  Tohoku University, Institute for Chemical Reaction Science Associated Professor, 反応化学研究所, 助教授 (60134061)

Co-Investigator(Kenkyū-buntansha) NAKANISHI Hachiro  Tohoku University, Institute for Chemical Reaction Science Professor, 反応化学研究所, 教授 (50240651)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordspoly (gamma-benzyl-alpha, L-glutamate) / Polymer Liquid Crystal / Dynamic Light Scattering / Polymer Liquid Crystal Gel / Sol-Gel Transition / Autocorrelation Function / Cooperative Diffusion / Scattering Spectrum
Research Abstract

Static and dynamic light scattering measurements have been performed on the association and gelation processes for poly (gamma-benzyl-alpha, L-glutamate) (PBLG) -toluene systems. In the quasi-equilibrium state of gelation (I), the slow mode has been observed in the obtained autocorrelation function (ACF), which was assigned to be a cooperative self-diffusion mode for aggregated PBLG chains in an isotropic phase. In addition, the ACF measured was modulated vibrationally near the gelation threshold. The apparent frequency of this modulation was influenced by thermal hysteresis and the time of elapse. In fact, the modulation was diminished after about one day. This phenomenon could be explained by the superposition of the fluctuation of concentration and the viscoelastic interaction between pre-gel domains. Thus, these facts seem that the gelation may occur by the nucleation and growth process in this case (I). On the other hand, it has become apparent experimentally that the gelation in the quenched non-equilibrium of gelation (II) has proceeded by the spinodal decomposition process, according to the Cahn's theory. As a result, the spinodal temperature could be first determined experimentally in the PBLG-toluene phase diagram. The fractal dimension increased and the correlation length decreased with increasing concentration of toluene solution, and, especially, the correlation length in PBLG gel was shorter than the characteristic maximum wavelength for concentration fluctuation occurred just after quenching, which describes that gel formed by the quenching made a more dense structure.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] H, Oikawa: "Dynamic Light Scattering Study on Sol-Gel Transition of Poly(γ-Benzyl L-Glutamate)-Toluene Solutions." J.Macromol.Sci.Phys.B36. 87-101 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H, Oikawa: "Spinodal Decomposition and Gel Structure of Quenched Poly(γ-Benzyl L-Glutamate)-Toluene Solutions." J.Macromol.Sci.Phys.B36. 487-501 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Oikawa: "Dynamic Light Scattering Study on Sol-Gel Transition of poly (gamma-benzyl-alpha, L-glutamate) -Toluene Solutions." J.Macromol Sci., Phys.B36. 87-101 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Oikawa: "Spinodal Decomposition and Gel Structure of Quenched poly (gamma-benzyl-alpha, L-glutamate) -Toluene Solutions" J.Macromol.Sci., Phys.B36. 487-501 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Oikawa: "Spinodal Decomposition and Gel Structure of Quenched Poly(γ-Benzyl L-Glutamate)-Toluene Solutions" J.Macromol.Sci.Phys.B36. 487-501 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H. Oikawa: "Dynamic Light Scattering Study on Sol-Gel Transition of Poly (γ-Benzyl L-Glutamate) -Toluene Solutions" J. Macromol. Sci., Phys.B36. 87-101 (1997)

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi