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Development and Dynamics of Liquid Crystalline Structures Studied by Heterodyne Dynamic Light Scattering Spectroscopy

Research Project

Project/Area Number 07651108
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 InstitutionKYOTO UNIVERSITY

Principal Investigator

TSUNASHIMA Yoshisuke  Kyoto University, Institute for Chemical Research, Associate Professor, 化学研究所, 助教授 (30089130)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsHeterodyne method / Lyotropic liquid crystals / Dynamic light scattering / Cellulose acetates / Dimethylacetamide / Selfassembly / Conformational transition / 形態転移 / トリフルオロ酢酸 / ジメチルホルムアミド / 液晶形成臨界濃度 / みみず鎖 / セルフアセンブルー
Research Abstract

The transition from the isotropic to anisotropic phase occured in lyotropic liquid crystalline polymers such as celllulose acetates were examined in view of the polymer chain stiffness, the chain dynamics, and the intermolecular associations which depend strongly on the polymer concentration in solution and on the solvent quality. The critical concentration v_2 where the lyotropic liquid crystals (LLC) appear was 24-26wt% for cellulose triacetates (CTA,degree of substitution DS=2.9) and higher for cellulose diacetates (DS=2.40) in trifluoroacetic acid (TFA), whereas in demethylacetamide (DMAc) v_2 was more than 50wt% for CTA and 45wt% for CDA.LLC was never observed for CTA in chloroform and for CDA in dimethylformamide. The difference in v_2 with solvents indicates that CTA and CDA take a molecular conformation specific to the solvent. Indeed, the chain stiffness of CTA and CDA analyzed on the basis of the wormlike chain model revealed that they are semiflexible chains with q=10 and 8 … More nm in TFA and DMAc, respectively, and flexible chains in other solvents. Here q is the persistence length which represents the chain stiffness. Dynamic light scattering measurements for CDA fractions in DMAc in the dijute and semidilute solution regions showed that the CDA single molecule coexists with the intermolecular associations which may be formed with the hydrogen bonding between the intermolecular C-6 position OHs in the glucose unit. The CDA association was in two states, the selfassembly of four (State II) and 13-40 (State III) times as long as the single CDA chain. State II transformed to State III with increasing the CDA concentration. In addition, State III took three states, depending on the CDA concentration ; a long rigid-like structure and two huge structures, the latter being not so rigid and long as the former. The former long-rigid structure is considered to be a prototype of LLC formed by CDA in DMAc. The selfassemblies described above, however, disappeared in the external field such as the viscometric shear and the ultracentrifugal fields : the associations might be transient structures which cann't be retained under weak forces and collapse easily to a single chain. It is interesting that the CDA has a conformation six times stiffer than that in the shear field. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Y.Tsunashima: "Stiff Chain Behavior and Strucure Formation of Cellulose Diacetate in N, N-Dimethylacetamide Solution" Macromolecules. in press (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Dilute Solution Properties of Functional Polysaccharides" Cellulose Commun.3. 13-17 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Tsunashima: "Dynamics and Structures of Polymers in Solution" Proc. 1st Intl. Sympo., ICRIS '96. 1. 14-19 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Hydrodynamic Behavior and Semiflexibility of a Disubstituted Polyacetylene with Silyl Group, Poly [(1-trimethylsilyl)-1-propyne), in Dilute Solution" ICR Annual Report 1995. 2. 28-29 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Dilute Solution Properties of Functional Polysaccharides" Molecular Properties of Functional Polysaccharides: Proceeding of 1st Microsymposium of the Cellulose Society of Japan. 1. 7-10 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima, H.Hara, H.Narita, F.Horii: "Hydrodynamic Behavior and Semiflexibility of a Disubstituted Polyacetylene with Silyl Group, Poly [(1-trimethylsilyl)-1-propyne), in Dilute Solution" ICR Annual Report 1995. 2. 28-29 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Stiff Chain Behavior and Structure Formation of Cellulose Diacetate in N,N-Dimethylacetamide Solution" Macromolecules. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Dilute Solution Properties of Functional Polysaccharides" Cellulose Commun.3. 13-17 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Dynamics and Structures of Polymers in Solution" Proc.lst Intl.Sympo., ICRIS '96. 1. 14-19 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tsunashima: "Hydrodynamic Behavior and Semiflexibility of a Disubstituted Polyacetylene with Silykl Group, Poly [[1-trimethylsilyl) -1-propyne), in Dilute Solution" ICR Anual Report 1995. 2. 28-29 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kawanishi: "Dynamic Light Scattering Studies of Cellulose Diacetate in Dilute N,N-dimethylacetamide solution" Polym.Prepr.Jpn.45・5. 754-754 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Kawanishi: "Stiff Chain Behavior and Structure Formation of a Cellulose Diacetate in Solution" Polym.Prepr.Jpn.45・12. 3386-3387 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Tsunashima: "Dilute Solution Properties of Functional Polysaccharides" Cellulose Commun.3・1. 13-17 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Tsunashima: "Dynamics and Structures of Polymers in Solution" Proc.1st Intl.Sympo.,ICRIC'96. 1. 14-19 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y. Tsunashima: "Dilute Solution Properties of Functional Polysaccharides" Molecula Properties of Functional Polysaccharides: Proceeding of 1st Microsymposium of the Cellulose Society of Japan. 1. 7-10 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Tsunashima, H. Hara, H. Narita, F. Horii: "Hydrodynamic Behavior and Semiflexibility of a Disubstituted Polyacetylene with Silyl Group, Poly[(1-trimethylsilyl)-1-propyne), in Dilute Solution" ICR Annual Report 1995. 2. 28-29 (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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