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1987 Fiscal Year Final Research Report Summary

THE ORIENTATION-DEPENDENT INTERACTION ENERGY AS STUDIED BY THE POLARIZABILITY ANISOTROPY ANALYSIS

Research Project

Project/Area Number 61470098
Research Category

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

Allocation TypeSingle-year Grants
Research Field 高分子物性
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

ABE AKIHIRO  PROFESSOR, TOKYO INSTITUTE OF TECHNOLOGY, 工学部, 教授 (50114848)

Project Period (FY) 1986 – 1987
KeywordsLIQUID CRYSTALS / POLARIZABILITY ANISOTROPY / DEPOLARIZATION RAYLEIGH SCATTERING / conformation / deuterium nmr / 分子間相互作用
Research Abstract

Molecular asymmetry is a feature common to all liquid crystalline substances. Soft-tails or spacers joined with a mesogenic core tend to take extended conformations along the director of the field. The polarizability anisotropy of molecules causes the intermolecular London attractions to be anisotropic, with the results the parallel intermolecular alignment is favored. For regid rods, we can elucidate the anisotropic part of the polarizability tensor from the depolarization Rayleigh scattering (DRS) measurements. The same technique cannot be used for the flexible chains which orient only under the anisotropic environment. The polarizability anisotropy of these flexible chains may be calculated by assuming the bond-additivity rule along the chain, provided that the conformations permitted in the anisotropic state are known. As we have demonstrated in a separate work, the latter information can be obtained by using the deuterium NMR technique.
In fiscal 1986, a commercial DRS apparatus, modified slightly in the filtering system, was installed in our laboratory. In the following year, the optical anisotropy measurements were carried out for a series of dipeptides. The limit of thereliability of the apparatus was thus tested. Measurements were also performed for some typical mesogenic compounds such as PAA and MBBA. Finally, the polarizability anisotropy of nCB, a compound comprising cyanobiphenyl core and n-alkyl tail, was estimated according to the procedure described above. Contribution from the flexible tail was found to be substantial. The results obtained for the system with n=5 and 8 are consistent with the odd-even effect observed in various thermodynamic properties at the nematic-isotropic transition temperature. The mothodology we have abopted in this work was thus proved to be useful.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] AKIHIRO ABE: MOL. CRYST. LIQ. CRYST.(1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] TOSHIMASA YAMAZAKI: BIOPOLYMERS. (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] AKIHIRO ABE: BIOPOLYMERS. (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] AKIHIRO ABE: TO BE PRESENTED AT HE IUPAC 32ND INTERNATIONAL SYMPOSIUM ON MACROMOLECULES, KYOTO, Aug. 1-6, 1988.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] AKIHIRO ABE: TO BE PRESENTED AT THE IUPAC 32ND INTERNATIONAL SYMPOSIUM ON MACROMOLECULES, KYOTO, AUG. 1-6, 1988.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] AKIHIRO ABE: "MOLECULAR ORDERING IN LIQUID CRYSTALS CARRYING FLEXIBLE HYDROCARBON TAILS - A ROTATIONAL ISOMERIC STATE ANALYSIS OF D-MNR DATA OF EMSLEY ET AL. ON 4-n-ALKYL-4'-CYANOBIPHENYLS (nCB)" MOL. CRYST. LIQ. CRYST.(1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TOSHIMASA YAMAZAKI: "CONFORMATIONAL STUDIES OF N-ACETYL-N'-METHYLAMIDE DERIVATIVES OF <ALPHA>-AMINOBUTYRIC ACID, NORVALINE, AND VALINE. 1.PREFERRED CONFORMATIONS IN SOLUTION AS STUDIED BY LH-NMR SPECTROSCOPY" BIOPOLYMERS. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] AKIHIRO ABE: "CONFORMATIONAL STUDIES OF N-ACETYL-N'-METHYLAMIDE DERIVATIVES OF <ALPHA>-AMINOBUTYRIC ACID, NORVALINE, AND VALINE. 2.CONFORMATIONAL ENERGY CALCULATIONS AND COMPARISON WITH EXPERIMENTAL RESULTS" BIOPOLYMERS. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] AKIHIRO ABE: "DEUTERIUM NMR STUDIES OF THE ORIENTATIONAL ORDER PARAMETERS OF poly(<gamma>-benzyl l-glutamate)s in the lyotropic liquid crystalline state" TO BE PRESENTED AT THE IUPAC 32ND INTERNATIONAL SYMPOSIUM ON macromolecules, kyoto, aug. 1-6, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] AKIHIRO ABE: "MOLECULAR ORDERING AND THERMODYNAMIC PROPERTIES OF DIMER AND POLYMER LIQUID CRYSTALS - A RIS ANALYSIS OF DEUTERIUM NMR SPECTRA" TO BE PRESENTED AT THE IUPAC 32ND INTERNATIONAL SYMPOSIUM ON macromolecules, kyoto, aug. 1-6, 1988.

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

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Published: 1989-03-30  

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