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

2002 Fiscal Year Final Research Report Summary

Development of Flexible and Large area Liquid Crystal Display Devices

Research Project

Project/Area Number 12793005
Research Category

Grant-in-Aid for University and Society Collaboration

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

Principal Investigator

KIKUCHI Hirotsugu  Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (50186201)

Co-Investigator(Kenkyū-buntansha) SASAKI Sono  Faculty of Engineering, Assistant Professor, 大学院・工学研究院, 助手 (40304745)
TAKAHARA Atsushi  Institute for Materials Chemistry and Engineering, Professor, 先導物質化学研究所, 教授 (20163305)
Project Period (FY) 2000 – 2002
Keywordsliquid crystal / display / phase separation / electro-optical effect / light switching / polymer network
Research Abstract

Composite materials consisting of polymers and low molecular weight liquid crystals (LCs) are promising materials for preparation of electro-optical devices such as displays and electrically controllable light shutters. A practical method of producing composites is by photopolymerization induced phase separation of an initially miscible solution of polymer precursor, crosslinker LCs. The performance of the composites strongly depends on the final morphology of the polymer network and the LC domains. The morphology is determined by both thermodynamics and kinetics of phase separation during the preparation processes. In this stud novel composite materials consisting of vinyl ether copolymers and LCs were prepared to develop a large-area and flexible display for addressing by simple multiplex electrodes.
A bicontinuous phase separation of polymer and LCs was induced by photopolymerization of monomers solved in L Conventional (polymer/LC) composites have been poor in the multiplexing capab … More ility because of insufficient steepness of the opti transmission-electric voltage curve. A typical magnitude of steepness, V_<80>/V_5 is larger than 1.4 for conventional (polymer/L composites, where V_<80> and V_5 are 80 % transmittance voltage and 5 % transmittance voltage, respectively. In contrast, an extrem steep response was achieved for novel (vinyl ether copolymer/LCs) composites by optimizing the monomer component, the phcirradiation temperature the photo-irradiation intensity and so on. The magnitude of V_<80>/V_5 ranged 1.25 to 1.35 which can give optical contrast ratio of 30-70 at the multiplex level of 8. The mechanism of the electro-optical response was investigated based light scattering characteristics, dielectric properties, morphology rheology, polymerization kinetics and phase-separation kinetics. The timing between the occurrence of the spinodal decomposition or the viscoelastic phase separation into polymer rich and LCs-rich pha and the development of polymer network during photopolymerization of (monomers/LCs) mixture solution was a dominant factor control the electro-optical properties. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] S-K.Hong, H.Kikuchi, T.Kajiyama: "Novel Method for Uniform Orientation of Liquid Crystal Molecules by Polyimide Surface Exposed to a Water Flow"Liquid Crystals. Vol.27. 547-550 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kajiyama, H.Yamane, H.Kikuchi: "Bistable Memory Switching of (Liquid Crystalline Copolymer/Low Molecular Weight Liquid Crystal) Composite Systems"Molecular Crystals Liquid Crystals. Vol.346. 217-227 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yang, H.Kikuchi, T.Kaajiyama: "(Homeotropically Oriented Polymer Network/Side Chain Type Liquid Crystalline Polymer/Liquid Crystals/Chiral Dopant) Composite with Thermally-Addressed and Electrically-Erasable Properties Electrically-Erasable Properties"Molecular C.rystals Liquid Crystals. Vol.381. 85-99 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kawasaki, H.Yang, H.Kikuchi, T.Kajiyama: "Transient Light Scattering of Ferroelectric Liquid Crystals Enhanced by Adding Ferroelectric Liquid Crystalline Polymers"Molecular Crystals and Liquid Crystals. Vol.381. 69-84 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yang, H.Kikuchi, T.Kajiyama: "Thermal Switching Characteristics Based on smectic-A -Chiral Nematic Phase Transition of (Liquid Crystals/Chiral Dopant) Composites, with and without Side Chain-type Liquid Crystalline Polymer"Liquid Crystals. Vol.29. 1141-1149 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kikuchi, M.Yokota, Y.Hisakado, H.Yang, T.Kajiyama: "Polymer-stabilized Liquid Crystal Blue Phases"Nature Materials. Vol.1. 64-68 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S-K.Hong, H.Kikuchi, T.Kajiyama: "Novel Method for Uniform Orientation of Liquid Crystal Molecules by a Polyimide Surface Exposed to a Water Flow"Liquid Crystals. Vol.27. 547-550 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kajiyama, H.Yamane, H.Kikuchi: "Bistable Memory Switching of (Liquid Crystalline Copolymer/Low Molecular Weight Liquid Crystal) Composite Systems"Molecular Crystals Liquid Crystals. Vol.346. 217-227 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Yang, H.Kikuchi, T.Kaajiyama: "(Homeotropically Oriented, Polymer Network/Side Chain Type Liquid Crystalline Polymer/Liquid Crystals/Chiral Dopant) Composite with Thermally-Addressed and Electrically-Erasable Properties"Molecular Crystals Liquid Crystals. Vol.381. 85-99 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kawasaki, H.Yang, H.Kikuchi, T.Kajiyama: "Transient Light Scattering of Ferroelectric Liquid Crystals Enhanced by Adding Ferroelectric Liquid Crystalline Polymers"Molecular Crystals and Liquid Crystals. Vol.381. 69-84 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Yang, H.Kikuchi, T.Kajiyama: "Thermal Switching Characteristics Based on smectic-A - Chiral Nematic Phase Transition of (Liquid Crystals/Chiral Dopant) Composites, with and without Side Chain type Liquid Crystalline Polymer"Liquid Crystals. Vol.29. 1141-1149 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kikuchi, M.Yokota, Y.Hisakado, H.Yang, T.Kajiyama: "Polymer-stabilized Liquid Crystal Blue Phases"Nature Materials. Vol.1. 64-68 (2002)

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

URL: 

Published: 2004-04-14  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi