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1999 Fiscal Year Final Research Report Summary

Liquid Crystal Alignment Induced by Polyimides Exposed to Linearly Polarized Light

Research Project

Project/Area Number 10555301
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 工業物理化学
Research InstitutionTokyo Institute of Technology

Principal Investigator

IKEDA Tomiki  Tokyo Institute of Technology, Research laboratory of Resources Utilization, Professor, 資源化学研究所, 教授 (40143656)

Co-Investigator(Kenkyū-buntansha) TAKEUCHI Yasumasa  JSR Corporation, Senior Technical Advisor, 担当役員付常勤顧問、研究職
KANAZAWA Akihiko  Tokyo Institute of Technology, Research laboratory of Resources Utilization, Assistant Professor, 資源化学研究所, 助手 (80272714)
SHIONO Takeshi  Tokyo Institute of Technology, Research laboratory of Resources Utilization, Associate Professor, 資源化学研究所, 助教授 (10170846)
MATSUKI Yasuo  JSR Corporation, Fine Electronic Research Laboratories, Senior Research Scientist, 精密電子研究所, テーマリーダー研究職
Project Period (FY) 1998 – 1999
KeywordsPolyimide / Alignment Layer / Polarized Light / Liquid Crystals / Photoinduced Alignment / Non-Rubbing Alignment / 光駆動
Research Abstract

Through this study on photoalignment (non-robbing alignment) technique for liquid crystal (LC) devices, we have revealed that aromatic polyimides (Pis) exposed to linearly polarized UV light (366 nm) show a high alignment efficiency without significant change in the chemical structure of PIs. We extended the PI films as an alignment layer to dynamic control technique of nematic LCs (NICs). The most significant characteristic of this system is to utilize photoinduced Freedericksz transition as a trigger to control alignment of NICs. We realized the optical switching of with the photosensitive PIs containing benzophenone moiety as an alignment film. It became clear that the threshold voltage of Freedericksz transition, at which change in the LC alignment occurs, is quite different between irradiated and unitradiated conditions. It was found that photoirradiation at 366 nm resulted in the immediate change in the transmittance when bias voltage of 4.5 V was applied across the cell. Although the mechanism is not well understood at the present stage, formation of intra- or intermolecular charge transfer complexes in the surface area of PI films by photoirradiation ( i.e., change in the polarity) seems to participate in the phenomenon. In conclusion, we have shown for the first time that the photosensitive PI films enable optical control of Freedericksz transition of NLCs. This phenomenon is useful for development of polarization-controllable materials in which permanent electric polarization is controlled by change in dipolar alignment based on Freedericksz transition.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Y. Wu: "Three-dimensional Manipulation of Azo Polymer Liquid Crystal by Unpolarized Light"Adv. Mater. 11. 300-302 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Wu: "Photoinduced Alignmen of Polymer Liquid Crystals Containing Azobenzene Moieties in the Side Chain 5 Effect of the Azo Contents on Alignment Behavior and Enhanced Response"Macromolecules. 32. 3951-3956 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G. K. Kim: "Optical Switching of Nematic Liquid Crystal by Means of Photoresponsive Polyimides as an Alignment Laye"Appl. Phys. Lett.. 75. 3458-3460 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Wang: "Homogeneous Alignment of Nematic Liquid Crystal Induced by Polyimide Exposed to Linearly Polarized Light"Appl. Phys. Lett.. 72. 545-547 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Wang: "Generation on Nematic Liquid Crystal alignment with Polyimides exposed to Linerly Polarized Light of Long Wavelength"J. Appl. Phys.. 84. 181-188 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Wang: "Alignment of a Nematic Liquid Crystal Induced by Anisotropic Photooxidation of Photosensitive Polyimide Films"J. Appl. Phys.. 84. 4573-4578 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Wu, Q. Zhang, A. Kanazawa, T. Shiono and T. Ikeda: "Photoindeced Alignment of Polymer Liquid Crystals Containing Azobenzene Moieties in the Side Chain. 4. Dynamic Study of the Alignment Process"Polymer. 40. 4787-4793 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Wu, Q. Zhang and T. Ikeda: "Three-Dimensional Manipulation of Azo Polymer Liquid Crystal by Unpolarized Light"Adv. Mater.. 11. 300-302 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Wu, Q. Zhang, A. Kanazawa, T. Shiono, T. Ikeda and Y. Nagase: "Photoindeced Alignment of Polymer Liquid Crystals Containing Azobenzene Moieties in the Side Chain. 5. Effect of the Azo Contents on Alignment Behavior and Enhanced Response"Macromolecules. 32. 3951-3956 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.-H. Kim, S. Enomoto, A. Kanazawa, T. Shiono Ikeda and L.-S. Park: "Optical Switching of Nematic Liquid Crystal by Means of Photoresponsive Polymides as an Alignment Laye"Appl. Phys. Lett.. 75. 3458-3460 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Wang, A. Kanazawa, T. Shiono T. Ikeda, Y. Matuski and Y. Takeuchi: "Homogeneous Alignment of Nematic Liquid Crystal Induced by Polymide Exposed to Linearly Polarized Light"Appl. Phys. Lett.. 72. 545-547 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Wang, A. Kanazawa, T. Shiono T. Ikeda, Y. Matuski and Y. Takeuchi: "Generation of Nematic Liquid Crystal Alignment with Polyimides Exposed to Linearly Polarized Light of Long Wavelength"Appl. Phys. Lett.. 84. 181-188 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Wang, A. Kanazawa, T. Shiono T. Ikeda, Y. Matuski and Y. Takeuchi: "Alignment of a Nematic Liquid Crystal Induced by Anisotropic Photooxidation of Photosensitive Polyimide Films"Appl. Phys. Lett.. 84. 4573-4578 (1998)

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

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Published: 2001-10-23  

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