2003 Fiscal Year Final Research Report Summary
Studies on Multifunctional Block Copolymers for Holography
| Project/Area Number |
14550293
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
OGINO Kenji Tokyo University Agriculture And Technology, Graduate School of Bio-Applications and Systems Engineering, Associate Professor, 大学院・生物システム応用科学研究科, 助教授 (10251589)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Block Copolymer / Liquid Crystal / Carbazole / Microphase Separation / Charge Transfer Complex / Thioxanthene / Fluorene / Photorefractivity |
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| Research Abstract |
Novel photorefractive (PR) block copolymers consisting of photoconductive and electro-optically(EO) active blocks were synthesized via the atom transfer radical polymerization (ATRP) of acrylates with cyanobiphenyl (GB) unit followed by the polymerization of acrylate with carbazole(Cz) moiety. In DSC thermogram for block copolymer, two glass transition temperatures corresponding to those for both blocks were observed on the first run indicating that both blocks were microphase separated each other. By four-wave mixing (FWM) experiments for the polymers doped with electron accepting compounds, 25% of diffraction efficiency was observed at 80 V/μm. This value was much higher than that observed in statistical copolymer with the similar chemical composition. In two-beam coupling (2BC) experiments, rnmetri c energy exchange (gain coefficient of 100 cm^<-1>) was observed at 45 V/μm. Novel asymmetric succinate (TH-NVA) containing electron accepting thioxanthone and electron donating 4-(2-nitrovinyl)aniline derivative was synthesized. TH-NVA was found to readily form an amorphous glass when the liquid sample was cooled in air at room temperature. Differential scanning calorimetry revealed that the melting point of crystalline sample and the glass transition temperature of glassy sample are 130 and 44℃, respectively. Absorption tail in longer wavelength region was due to the charge transfer interaction between electron accepting and donating units. In two beam coupling experiments, TH-NVA showed asymmetric energy transfer (coupling gain ; 42cm^<-1>) without an external electric field.
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