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Nonlinear Optics of Chained-Chromophore Polymer

Research Project

Project/Area Number 12650878
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 InstitutionTokyo Institute of Technology

Principal Investigator

KAWAUCHI Susumu  Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Research Assistat, 大学院・理工学研究科, 助手 (80204676)

Co-Investigator(Kenkyū-buntansha) WATANABE Junji  Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Professor, 大学院・理工学研究科, 教授 (90111666)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsNonlinear optics / Quantum chemical calculation / Molecular dynamics / Ferroelectric liquid crystal / Polyester / Polymeric liquid crystal
Research Abstract

Organic materials with high nonlinear optics (NLO) property tend to absorb visible light. This is a deficiency because they absorb second harmonic generated (SHG) light by themselves. Main aim of this project is to design novel liquid crystalline polymers (LCP) having high NLO property without such deficiency by using quantum chemical calculations and molecular dynamics (MD) calculations.
(1) The internal rotation of the ester linkage for phenyl benzoate (PB) and p-hydroxybenzoic acid (HBA) dimer (HB) as models of aromatic polyesters was investigated by using the density functional theory. The rotation of S bond, which mainly determines the linearity of the molecule, leads to the trans- and cis-conformers of PB. Since the cis-conformer of PB is 7.69 kcal mol^<-1> higher than the trans-conformer, the cis-conformer has little population at standard condition. HB does not have the cis-conformer. These agree with the experimental understanding that poly(p-hydroxybenzoic acid) is the class o … More f stiff and extended polymer.
(2) The aromatic copolyester of HBA and 6-hydroxy-2-naphtoic acid (HNA) shows strong SHG-activity in the nematic phase as well as the crystalline phase in spite of no absorption in the visible region. Quantum chemistry calculations show that the second-order hyperpolarizability of the HBA dimer is comparable to that of p-nitroaniline and it increases with the degree of polymerization. The large hyperpolarizability of the aromatic polyester is ascribed to the large electronic transition moment.
(3) The most stable molecular packing systems of aromatic polyester have been investigated by MD simulations performed for decamer (ten repeating units) of HBA in the nematic phase. The MD simulations were started from eight possible packing structures. Among them, we found the polar ordering structure with the intermolecular ester carbonyl groups aligned in the same direction is energetically most favorable. This is consistent with our previous experimental observation for the SHG intensity measurement. Less

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Internal Rotation of Ester Linkage in Phenyl Benzoate and Hydroxybenzoic Acid Dimer as Models of Aromatic Polyesters using Density Functional Theory"Macromolecular Theory and Simulations. 10. 434-440 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Conformational Analysis of 1,3-Benzenediol Dibenzoate as a Model of Banana-Shaped Molecules Forming Chiral Smectic Phases"Journal of Molecular Structure. 560. 275-281 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Ab Initio Study of Substituent Effect on SHG-Activity of Aromatic Esters"Nonlinear Optics. 26. 91-98 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Molecular Modeling of Polar Rod-Like Aromatic Polyester Forming Nematic Liquid Crystal. Part1. Ab Initio Study of Origin of Strong SHG-Activity"Molecular Crystals and Liquid Crystals. 346. 107-115 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Imase, S.Kawauchi, F.Sato, Y.Ebisawa, Y.Tamura, J.Watanabe: "Molecular Modeling of Polar Rod-Like Aromatic Polyester Forming Nematic Liquid Crystal. Part2. Molecular Dynamics Simulation for Polar Association of Molecules"Molecular Crystals and Liquid Crystals. 346. 117-126 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Imase, S. Kawauchi, and J. Watanabe: "Internal Rotation of Ester Linkage in Phenyl Benzoate and Hydroxybenzoic Acid Dimer as Models of Aromatic Polyesters using Density Functional Theory"Macromolecular Theory and Simulations. 10. 434-440 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Imase, S. Kawauchi, and J. Watanabe: "conformational Analysis of 1,3-Benzenediol Dibenzoate as a Model of Banana-Shaped Molecules Forming Chiral Smectic Phases"Journal of Molecular Structure. 560. 275-281 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Imase, S. Kawauchi, and J. Watanabe: "Ab Initio Study of Substituent Effect on SHG-Activity of Aromatic Esters"Nonlinear Optics. 26. 91-98 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Imase, S. Kawauchi, and J. Watanabe: "Molecular Modeling of Polar Rod-Like Aromatic Polyester Forming Nematic Liquid Crystal. Part1. As Initio Study of Origin of Strong SHG-Activity"Molecular Crystals and Liquid Crystals. 346. 107-115 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Imase, S. Kawauchi, F. Sato, Y. Ebisawa, Y. Tamura and J. Watanabe: "Molecular Modeling of Polar Rod-Like Aromatic Polyester Forming Nematic Liquid Crystal. Part2. Molecular Dynamics Simulation for Polar Association of Molecules"Molecular Crystals and Liquid Crystals. 346. 117-126 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Internal Rotation of Ester Linkage in Phenyl Benzoate and Hydroxybenzoic Acid Dimer as Models of Aromatic Polyesters using Density Functional Theory"Macromolecular Theory and Simulations. 10. 434-440 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Conformational Analysis of 1, 3-Benzenediol Dibenzoate as a Model of Banana-Shaped Molecules Forming Chiral Smectic Phases"Journal of Molecular Structure. 560. 275-281 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Ab Initio Study of Substituent Effect on SHG-Activity of Aromatic Esters"Nonlinear Optics. 26. 221-228 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Imase, S.Kawauchi, J.Watanabe: "Molecular Modeling of Polar Rod-Like Aromatic Polyester Forming Nematic Liquid Crystal. Part1. Ab Initio Study of Origin of Strong SHG-Activity"Molecular Crystals and Liquid Crystals. 346. 107-115 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Imase, S.Kawauchi, F.Sato, Y.Ebisawa, Y.Tamura, J.Watanabe: "Molecular Modeling of Polar Rod-Like Aromatic Polyester Forming Nematic Liquid Crystal. Part2. Molecular Dynamics Simulation for Polar Association of Molecules"Molecular Crystals and Liquid Crystals. 346. 117-126 (2000)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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