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High Speed Optical switching and Long Memory Life for (Liquid Crystalline Polymer/Liquid Crystal) Compopsite Films

Research Project

Project/Area Number 10450368
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 高分子構造・物性(含繊維)
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

KAJIYAMA Tisato  Kyushu Univ., Grad. School of Eng., Professor, 工学研究科, 教授 (60037976)

Co-Investigator(Kenkyū-buntansha) SASAKI Sono  Kyushu Univ., Grad. School of Eng., Assistant Prof., 工学研究科, 助手 (40304745)
KIKUCHI Hirotsugu  Kyushu Univ., Grad. School of Eng., Associate Prof., 工学研究科, 助教授 (50186201)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 1999: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1998: ¥7,900,000 (Direct Cost: ¥7,900,000)
Keywordsliquid crystal / liquid crystalline Polymer / Electro-optical Effect / Memory Effect / Smectic Phase / Display / Optical Switching
Research Abstract

(1) Reversible and bistable electro-optical switching characteristics of induced smectic composite systems compound of a side chain nematic liquid crystalline polymer (nematic LCP) and its copolymer with weak polar methoxy terminal groups in the side chains and low molecular weight nematic liquid crystals (nematic LCs) with each strong polar cyano end have been investigated. The liquid crystalline copolymer (LCcoP) with weak polar methoxy terminal groups in the side chains was used to improve the response speed at room temperature for the bistable and reversible light switching of the binary composite system. Since LCcoP with 52.5 mol% substituted mesogenic side chains did not exhibit mesophase characteristics, this LCcoP was named as pseudo LCcoP in the present study. The (pseudo LCcoP/nematic LCs) composite system showed an induced smectic phase over a wide range of mixing concentration and temperatures. A reversible and bistable electro-optical switching with a short response time ( … More 〜100 ms) was realized for the induced smectic binary composite system upon the application of an appropriate electric field at room temperature. Also, the binary composite system showed a reversible and bistable electro-optical switching based on the sign reversal of the dielectric anisotropy upon the application of ac electric fields with high (〜kHz) and higher (〜100kHz) driving frequencies.
(2) The influence of the mesogenic side chain fraction in side chain liquid crystalline copolymer (LCcoP) on electro-optical effects for (LCcoP/low molecular weight nematic liquid crystals : nematic LCs) composite system in a smectic state was studied in order to improve reversible and bistable electro-optical switching characteristics driven by as electro fields with two different frequencies. In the case of LCcoP fraction lower than 40wt% the magnitudes of glass transition temperature (Tg) and the mesophase temperature range for the binary composite systems were independent of the mesogenic side chain fraction in LCcoP, that is 〜220 K and 220-340K, respectively. In the case of the LCcoP fraction of 30wt% and also, its mesogenic side chain fraction of 52.5 and 32.5 mol%, the binary composite systems showed a homogeneous smectic phase at room temperature. On the other hand, the LCcoP with mesogenic chain side fraction of 16.5 mol% did not exhibit any mesomorphic characteristics at any temperature without any addition of LCs. Then, this LCcoP was named as the pseudo LCcoP in this study. However, the (pseudo LCcoP/nematic LCs) composite system showed a novel type of induced smectic phase over a wide range of both mixing concentration (35-85 wt% of the pseudo LCcoP) and temperature (220-320K). This composite system showed a fast switching speed form a transparency state to a light scattering state. Therefore, it was reasonably concluded that the application of LCcoP with the optimum substituent fraction of mesogenic side chain is useful to realize a high electro-optical switching speed (〜50 ms) as well as a stable memory effect (〜years) at room temperatures. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] H. Kikuchi, H. K. Jeong, T. Kajiyama: "Electro-Optical Effect Without Hysteresis for (Polymer/Liquid Crystal) Composite Films"Mol. Cryst. Liq. Cryst. 318. 209-223 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 山根大和,楊 槐,古屋吉啓,Hwan-Kyeong JEONG Kumar RAJESH,菊池裕嗣,梶山千里: "(側鎖型液晶共重合体/低分子液晶)誘起スメクチック複合系のメモリー性光スイッチングの高速化"電子情報通信学会報. 157-162 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] h. Yamane, H. Kikuchi, T. Kajiyama,: "Relationship between Mesogenic Side Chain Fraction in Liquid Crystalline Copolymer and Cistable Electro-Optical Switching for (Liquid Crystalline Copolymer Copolymer/Liquid Crystals) Composite Systems"Macromolecules. 31(23). 8100-8109 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sung-Kyu HONG, Hirotsugu KIKUCHI, Tisato KAJIYAMA: "Polymer Surface-Induced Order of Liquid Crystalline Molecular Alignment Based on Nematic-Isotropic Phase Transition Behavior"Polymer Journal. 31. 160-166 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirokazu YAMANE, Hirotsugu KIKUCHI, Tisato KAJIYAMA: "Fast Bistable Switching Composite Systems of Side-Chain Liquid-Crystalline Copolymer and Low Molecular Weight Liquid Crystals"Polymer. 40. 4777-4785 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirotsugu KIKUCHI Shigeru KIBE, Hirokazu YAMANE, Tisato KAJIYAMA: "Light Transmission-Light Scattering Reverse Mode Switching of (Liquid Crystalline Polymer/Liquid Crystal) Composite System"Mat. Res. Soc. Syno. Proc. 559. 75-84 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Kikuchi, H. K. Jeong, T. Kajiyama: "Electro-Optical Effect Without Hysteresis for (Polymer/Liquid Crystal) Composite Films"Mol. Cryst. Liq. Cryst.. 318. 209-223 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Yamane, H. Kikuchi, T. Kajiyama: "Relationship between Mesogenic Side Chain Fraction in Liquid Crystalline Copolymer and Bistable Electro-Optical Switching for (Liquid Crystalline Copolymer/Liquid Crystals) Composite Systems"Macromolecules. 31(23). 8100-8109 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirokazu YAMANE, Hirotsugu KIKUCHI, Tisato KAJIYAMA: "Fast Bistable Switching Composite Systems of Side-Chain Liquid-Crystalline Copolymer and Low Molecular Weight Liquid Crystals"Mol. Cryst. Liq. Cryst.. Vol. 326. 291-308 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sung-Kyu HONG, Hirotsugu KIKUCHI, Tisato KAJIYAMA: "Polymer Surface-Induced Order of Liquid Crystalline Molecular Alignment Based on Nematic-Isotropic Phase Transition Behavior"Polymer Journal. 31. 160-166 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirokazu YAMANE, Hirotsugu KIKUCHI, Tisato KAJIYAMA: "Fast Bistable Switching Composite Systems of Side-Chain Liquid-Crystalline Copolymer and Low Molecular Weight Liquid Crystals"Polymer. 40. 4777-4785 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirotsugu KIKUCHI, Shigeru KIBE, Hirokazu YAMANE, Tisato KAJIYAMA: "Light Transmission-Light Scattering Reverse Mode Switching of (Liquid Crystalline Polymer/Liquid Crystal) Composite System"Mat. Res. Soc. Symp. Proc.. 559. 75-84 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Kikuchi,H.K.Jeong,T.Kajiyama: "Electro-Optical Effect Without Hysteresis for (Polymer/Liquid Crystal) Composite Films"Mol. Cryst. Liq. Cryst.. 318. 209-223 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Yamane,H.Kikuchi,T.Kajiyama: "Relationship between Mesogenic Side Chain Fraction in Liquid Crystalline Copolymer and Bistable Electro-Optical Switching for (Liquid Crystalline Copolymer/Liquid Crystals) Composite Systems"Macromolecules. 31(23). 8100-8109 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] 山根大和,楊 槐,古屋吉啓,Hwan-Kyeong JEONG Kumar RAJESH,菊池裕嗣,梶山千里: "(側鎖型液晶共重合体/低分子液晶)誘起スメクチック複合系のメモリー性光スイッチングの高速化"電子情報通信学会報. 157-162 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Sung-Kyu HONG,Hirotsugu KIKUCHI,Tisato KAJIYAMA: "Polymer Surface-Induced Order of Liquid Crystalline Molecular Alignment Based on Nematic-Isotropic Phase Transition Behavior"Polymer Journal. 31. 160-166, (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hirokazu YAMANE,Hirotsugu KIKUCHI,Tisato KAJIYAMA: "Fast Bistable Switching Composite Systems of Side-Chain Liquid-Crystalline Copolymer and Low Molecular Weight Liquid Crystals"Polymer. 40. 4777-4785 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hirotsugu KIKUCHI,Shigeru KIBE,Hirokazu YAMANE,Tisato KAJIYAMA: "Light Transmission-Light Scattering Reverse Mode Switching of (Liquid Crystalline Polymer/Liquid Crystal) Composite System"Mat. Res. Soc. Synp. Proc.. 559. 75-84 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Kikuchi,H.K.Jeong,T.Kajivama: "Electro-Optical Effect Without Hysteresis for (Polymer/Liquid Crystal) Composite Films" Mol.Cryst. Liq. Cryst.318. 209-223 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Yamane,H.Kikuchi,T.Kajiyama: "Relationship between Mesogenic Side Chain Fraction in Liquid Crystalline Copolymer and Bistable Electro-Optical Switching for (Liquid Crystalline Copolymer/Liquid Crystals) Composite Systems" Macromolecules. 31(23). 8100-8109 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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