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

1994 Fiscal Year Final Research Report Summary

Liquid Crystal Polymer Systems For Rewritable Optical Recording

Research Project

Project/Area Number 04555214
Research Category

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

Allocation TypeSingle-year Grants
Research Field 高分子物性・高分子材料(含機械材料)
Research InstitutionTokyo Institute of Technology, Research Laboratory of Resources Utilization

Principal Investigator

ICHIMURA Kunihito  Tokyo Institute of Technology, Res.Lab.of Resouces Utilization ; Professor, 資源化学研究所, 教授 (90232412)

Co-Investigator(Kenkyū-buntansha) OHE Yasushi  Toppan Printing Co., Ltd., Central Research Lab. ; Researcher, 総合研究所, 研究員
YAMAMURA Shigeo  Nippon Kayaku Co., Ltd., Chemical Research Lab. ; Senior Researcher, 化学品研究所, 主任研究員
TAMAKI Takashi  National Institute for Materials and Chemical Research ; Division Head, 分子工学部, 研究部長
IKEDA Tomiki  Tokyo Institute of Technology, Res.Lab.of Resouces Utilization ; Professor, 資源化学研究所, 教授 (40143656)
Project Period (FY) 1992 – 1994
KeywordsAzobenzenes / Photoisomerization / Nematic liquid crystal / Phase change / Alignment regulation / Linearly polarized light / Photodegradation / Liquid crystalline polymer
Research Abstract

Two types of photosensitive liquid crystalline systems were studied to apply to reversible opticak memory.
1.Photoinduced phase change of liquid crystal polymers
(1) Photoinduced phase change of nematic liquid crystalline polymers into isotropic phase under UV-irradiation for the photoisomerization of doped azobenzenes was considerably enhanced by attaching non-mesogenic residues in the side chains as a result of the reduction of an order parameter of the mesophase. The recovery of the nematic phase was caused by illumination with blue light although an aging period was required.
2.Liquid crystal alignment photoregulation mediated by polymer surfaces
(1) An azimuthal alignment of nematic liquid crystal layrs was controlled by irradiation of a cell fabricated with substrate plates covered with photochromic molecular layrs with linearly polarized light. Rewriting of an optical memory based on this working principle was realized simply by changing an electric vector of actinic light.
(2) Three … More types of photoaligning polymer thin films were developed. The first involves the surface-selective introduction of azo-chromophores on a poly (vinyl alcohol) thin film. The second method is based on spin-coating of a thin film of polymers substituted with azobenzenes in their side chains. The third one consists of the deposition of Langmuir-Blodgett films of a polyimide bearing azobenzene units on a substrate plate.
(3) Factors affecting optical quality of photoimages and exposure energy required for liquid crystal reorientation were investigated. Photoimages resolving few mum lines and spaces were quite stable at a temperature below a nematic/isotropic transition temperature (T_<N1>) and erased by heating above T_<N1> or simply by overwriting with polarized actinic light with a different polarization plane.
(4) The surface-mediated optical recording is highly of practical significances because they can be operated by irradiation with a single light source emitting visible light which results in no observable photodegradation of azobenzenes. Less

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] K. Ichimura: "Photoregulation of liquid crystal allgnment induced by polarization photochromism of molecular films" Mol. Cryst. Liq. Cryst.246. 331-338 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Kawanishi, Y. Suzuki, M. Sakuragi, K. Ichimura: "Laser-induced orientational change of nematic liquid crystal-lline molecules mediated by photochomic reactions of surface azobenzenes" J. Photochem. Photobiol. A: Chem.80. 433-438 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Akiyama,K. Kudo, Y. Hayashi, K. Ichimura: "Photocontrol of azimuthal orientation of nematic liquid crystals by surface-modified poly( vinyl alcohol) thin films" J. Photopolym. Sci. Technol.7. 129-131 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Akiyama, K. Kudo, K. Ichimura: "Command surfaces. 10. Novel polymethacryiates with laterally attached azobenzene groups displaying photoinduced optical anisotropy" Macromo. Chem. , Rapid Commun.16. 35-41 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Akiyama, M. Momose, K. Ichimura S. Yamamura: "Surface-selective modification of poly( vinyl alcohol) films with azobenzenes for in-plane alignment photocontrol of nematic liquid crystals" Macromolecules. 28. 288-293 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 市村 國宏: "基板表面層分子による液晶配向の光制御" 表面. 32. 617-679 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Ichimura, T. Seki, M. Sakuragi, T. Tamaki: "Photo-reactive Materials for Ultrahigh Density Optical Memory" Elsevier, 28 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sasaki, T.Ikeda, K.Ichimura: "Time-resolved observation of photochemical phase transition in polymer liquid crystals" Macromolecules. 25. 3807-3811 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, Y.Hayashi, N.Ishizuki: "Photocontrol of in-plane alignment of a nematic liquid crystal by a photochromic spiropyran monolayr absorbing linearly polarized light" Chem.Lett.1063-1066 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Aoki, T.Seki, M.Sakuragi, K.Ichimura: "Convenient methods to prepare "command surfaces" by surface-selective modification of poly (vinyl alcohol) thin films with azobenzene units" Macromol.Chem.193. 2163-2174 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Aoki, T.Seki, Y.Suzuki, T.Tamaki, A.Hosoki, K.Ichimura: "Factors affecting photoinduced alignment regulation of cyclohexanecarboxylate-type nematic liquid crystals by azobenzene molecular films" Langmuir. 8. 1007-1013 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Aoki, T.Tamaki, T.Seki, Y.Kawanishi, K.Ichimura: "Regulation of alignment of cyanobiphenyl liquid crystals by azobenzene molecular films" Langmuir. 8. 1014-1017 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sasaki, T.Ikeda and K.Ichimura: "Photo-and thermal isomerization behaviors of azobenzene derivatives in liquid crystalline polymer matrices" Macromolecules. 26. 151-154 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, Y.Hayashi, Y.Kawanishi, T.Seki, T.Tamaki, N.Ishizuki: "p-Cyanoazobenzene as a command molecule for azimuthal anisotropy regulation of a nematic liquid crystal upon exposure to linearly polarized visible light" Langmuir. 9. 857-860 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, Y.Hahashi, N.Ishizuki: "Photo-optical liquid crystal cells driven by molecular rotors" Appl.phys.Lett.63. 449-451 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, Y.Hayashi, H.Akiyama, N.Ishizuki: "Linearly polarized light-induced regulation of in-plane reorientation of liquid crystalline molecule by azobenzenes laterally attached to substrate surfaces" Langmuir. 9. 3298-3304 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, H.Akiyama, N.Ishizuki, Y.Kawanishi: "Command surfaces 6. Azimuthal orientation of liquid crystals photocontrolled by an azobenzene pendent polymer" Macromol.Chem., Rapid Commun.14. 813-817 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura: "Photofunctional Chemistry(in Japanese)" Sangyo Tosho, Tokyo. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, Y.Hayashi, T.Ikeda, N.Ishizuki: "Regulation of azimuthal anisotropy of nematic liquid crystals by azobenzene monolayrs absorbing linearly polarized light" Chemistry of Functional Dyes. 359-364 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura: "Command surfaces (in Japanese)" Gendai Kagaku. 26-31 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura: "Photoregulation of liquid crystal alignment induced by polarization photochromism of molecular films" Mol.Cryst.Liq.Cryst.246. 331-338 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kawanishi, Y.Suzuki, M.Sakuragi, K.Ichimura: "Laser-induced orientational change of nematic liquid crystalline molecules mediated by photochromic reactions of surface azobenzenes" J.Photochem.Photobiol.A : Chem.80. 433-438 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akiyama, K.Kudo, Y.Hayashi, K.Ichimura: "Photocontrol of azimuthal orientation of nematic liquid crystals by surface-modified poly(vinyl alcohol)thin films" J.Photopolym.Sci.Technol.7. 129-131 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akiyama, K.Kudo, K.Ichimura: "Command surfaces.10. Novel polymethacrylates with laterally attached azobenzene groups displaying photoinduced optical anisotropy" Macromol.Chem., Rapid Commun.16. 35-41 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akiyama, M.Momose, K.Ichimura, S.Yamamura: "Surface-selective modification of poly (vinyl alcohol) films with azobenzenes for in-plane alignment photocontrol of nematic liquid crystals" Macromolecules. 28. 288-293 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura: "Photoregulation of liquid crystal alignment by photoisomerizable molecular layrs" Mol.Cryst.Liq.Cryst.in press.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akiyama, K.Kudo, K.Ichimura, S.Yokoyama, M.kakimoto.Y.imai: "Azimuthal photoregulation of a liguid crystal with an azobenzene-modified polyimide Langmuir-Blodgett monolayr" Langmuir. in press.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura: "Photocontrol of liquid crystal alignment by molecular surface layrs(in Japanese)" Hyomen. 32. 617-679 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura: "Photoalignment of liquid crystals (in Japanese)" Hikari Kagaku. 18. 32-38 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ichimura, T.Seki, Y.Kawanishi, Y.Suzuki, M.Sakuragi, T.Tamaki: "Photocontrol of liquid crystal alignment by "command surfaces"" Photo-reactive Materials for Ultrahigh Density Optical Memory, Ed.by M.Irie, Elsevier. 54-83 (1994)

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

URL: 

Published: 1996-04-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi