1995 Fiscal Year Final Research Report Summary
Design, Synthesis, and Evaluation of New Ferroelectric Liquid Crystals
| Project/Area Number |
05555238
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
有機工業化学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HIYAMA Tamejiro Tokyo Institute of Technology, Research Laboratory of Resources Utilization, Professor, 資源化学研究所, 教授 (90026295)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEHARA Sadao Central Research Laboratories, Dainippon Ink and Chemicals, Inc., Maneager, 記録材料技術1グループ, 上席主事主任研究員
KUSUMOTO Tetsuo Sagami Chemical Research Center, Research Fellow, 副主任研究員
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| Project Period (FY) |
1993 – 1995
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| Keywords | Ferroelectric Liquid Crystal / Chiral Dopant / Fluorine-substituted Liquid Crystal / Spontaneous Polarization / Dimeric Liquid Crystal / Oxidative Desulfurization-fluorination / Cross-coupling Reaction / Fast Switching |
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| Research Abstract |
Synthetic studies of ferroelectric liquid crystals (FLCs) have been extensively carried out, since FLC materials are expected to be applicable to displays with high speed switching. Synthetic design of FLCs with a large spontaneous polarization (Ps) and a short response time led to optically active compounds having a chiral center and a polar group at benzylic position. FLC mixtures doped with a cyanocyclopropane, fluorocyclopropane, gamma-lactone, tetrahydrofuran, or 1,3-dioxane derivative exhibited large Ps. The sign of Ps was found to well correlate to the absolute configuration of the chiral center of the compound. Design and synthesis of FLCs for fast switching led to optically active fluorine-substituted compounds like fluoroalkyl ethers, fluoroalkyl esters, fluoroalkanoic acid esters, and 1-arylfluoroalkanes. Especially phenylpyrimidines having 2-fluoroalkoxyl, 3-fluoroalkoxyl, or 3-fluoroalkyl group as a chiral chain realized short response time. Compounds containing 2,3-difluoroalkoxyl or 2-fluoro-2-methylalkanoyloxy group also were found to exhibit large Ps'.
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