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2004 Fiscal Year Final Research Report Summary

Liquid crystalline polymers with banana mesogens-Polarity and chirality induced by their banana shape

Research Project

Project/Area Number 15350130
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Polymer/Textile materials
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

WATANABE Junji  Tokyo Institute of Technology, Department of Polymeric and Organic Materials, Professor, 大学院・理工学研究科, 教授 (90111666)

Co-Investigator(Kenkyū-buntansha) KAWAUTI Susumu  Tokyo Institute of Technology, Department of Polymeric and Organic Materials, Assistant Professor, 大学院・理工学研究科, 助手 (80204676)
TOKITA Masatoshi  Tokyo Institute of Technology, Department of Polymeric and Organic Materials, Assistant Professor, 大学院・理工学研究科, 助手 (30301170)
Project Period (FY) 2003 – 2004
Keywordsbanana molecule / ferroelectricity / chirality / chiral conformation / frustrated structure / polymeric effect / smectic liquid crystal / bent molecule
Research Abstract

Liquid crystalline compounds with non-linear molecular shape, so-called banana-shaped molecules, have become a fruitful topic in liquid crystal researches since ferro-, anti-ferroelectricity and chrality were found in such achiral moleculear systems. A number of banana-shaped liquid crystalline molecules have been synthesized and studied by particularly modifying of the well-known banana-shaped molecule 1,4-phenylene [4-(4-n-alkoxypheny liminomethyl)benzoates, P-n-O-PIMB, subsequently, a variety of liquid crystalline phases and interesting properties have been revealed. In this study, we prepare a new homologous series of banana-shaped molecule containing oxadiazole core,2,5-bis(4'-n-alkylcarboxy biphenyl-4-yl)-[1,3,4]-oxadiazole (ODBBP-n) to extend the study on the polymeric banana molecules. To our knowledge, this is the first example of five-membered heterocyclic liquid crystalline molecule that exhibits banana class mesophase. In addition, the relationship between the bending geometry and mesomorphic behavior of ODBBP-n is also demonstrated by comparing with thiaziazole core derivatives. The results obtained simply described below.
1)From the analysis of chiral memory between B2 and B4 phases, it was concluded that the spontaneously arising chirality is due to the chiral conformation characteristic of the banana shape.
2)In ferroelectric B2 phase, the distinct layer undulation takes place as a result of the interplay between the spontaneous polarization and layer elasticity.
3)In the banana molecules with the asymmetric alkyl tails, it was found that antiferroelectric phase is altered to the ferroelectric phase when two tail groups have the remarkable difference in their length.
4)The extension of the study to the polymeric system failed because of the high temperature melting of polymer. Now, we try to synthesize the dimer and trimer of banana molecules.

  • Research Products

    (11 results)

All 2005 2004 2003

All Journal Article (11 results)

  • [Journal Article] Novel unsymmetric achiral banana-shaped molecules having different lengths of alkyl chains2005

    • Author(s)
      Kumiko Ogino, Takayuki Doi, Takashi Takahashi, Hideo Takezoe, Junji Watanabe
    • Journal Title

      Chemistry Letters 34

      Pages: 450-451

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Important role played by interlayer steric interaction for the emergence of ferroelectric phase in bent-core mesogens2004

    • Author(s)
      Kazuya Kumazawa, Michi Nakata, Yochi Takanishi, Ken Ishikawa, Junji Watanabe, Hideo Takezoe
    • Journal Title

      J.Mater.Chem. 14

      Pages: 157-164

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Solid State^<13>C NMR Study on Chiral Twisted Conformatic Attributable to Chirality in Smectic Phases of Achiral Banana-Shaped Molecules2004

    • Author(s)
      H.Kurosu, M.Kawasaki, M.Hirose, M.Yamada, S.Kang, J.Thisayukta, M.Sone, H.Takezoe, J.Watanab
    • Journal Title

      J.Phys.Chem. 108

      Pages: 4674-4678

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Chiral memory on transition between B2 and B4 phases in an achiral banana-shaped molecular system2004

    • Author(s)
      H.Niwano, M.Nakata, J.Thisayukta, D.R.Link, H.Takezoe, J.Watanabe
    • Journal Title

      J.Phys.Chem.B 108

      Pages: 14889-14896

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Important role played by interlayer steric interaction for the emergence of ferroelectric phase in bent-core mesogens2004

    • Author(s)
      Kazuya Kumazawa, Michi Nakata, Yoichi Takanishi, Ken Ishikawa, Junji Watanabe, Hideo Takezoe
    • Journal Title

      J.Mater.Chem. 14

      Pages: 157-164

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Solid State ^<13>C NMR Study on Chirai Twisted Conformation Attributable to Chirality in Smectic Phases of Achiral Banana-Shaped Molecules2004

    • Author(s)
      H.Kurosu, M.Kawasaki, M.Hirose, M.Yamada, S.Kang, J.Thisayukta, M.Sone, H.Takezoe, J.Watanabe
    • Journal Title

      J.Phys.Chem. 108

      Pages: 4674-4678

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Chiral memory on transition between B2 and B4 phases in an achiral banana-shaped molecular system2004

    • Author(s)
      H.Niwano, M.Nakata, J.Thisayukta, D.R.Lank, H.Takezoe, J.Watanabe
    • Journal Title

      J.Phys.Chem.B 108

      Pages: 14889-14896

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Polarization-Modulated Smectic Liquid Crystal Phase2003

    • Author(s)
      W.Weissflog, L.-C.Chien, D.M.Walba, J.Zasadzinski, J Watanabe, H.Takezoe, N.A.Clark
    • Journal Title

      Science 301

      Pages: 1204-1211

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Local layer structures in circular domains of an achiral bent-core mesogen observed by X-ray microbeam diffraction2003

    • Author(s)
      Y.Takanishi, T.Ogasawara, K.Ishikawa, H.Takezoe, J.Watanabe, Y.Takahashi, A.Iida
    • Journal Title

      Phys.Rev. E68

      Pages: 011706

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Polarization -Modulated Smectic Liquid Crystal Phase2003

    • Author(s)
      W.Weissflog, L.-C.Chien, D.M.Walba, J.Zasadzinski, J Watanabe, H.Takezoe, N.A.Clark
    • Journal Title

      Science 301

      Pages: 1204-1211

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Local layer structures in circular domains of an achiral bent-core mesogen observed by X-ray microbeam diffraction2003

    • Author(s)
      Y.Takanishi, T.Ogasawara, K.Ishikawa, H.Takezoe, J.Watanabe, Y.Takahashi, A.Iida
    • Journal Title

      Phys.Rev., E 68

      Pages: 011706

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

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Published: 2006-07-11  

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