| Project/Area Number |
59470089
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性
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| Research Institution | Kyoto University |
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Principal Investigator |
YAMAMOTO Masahide Kyoto University, Dept. of Polym. Chem. Professor, 工学部, 教授 (40025961)
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| Co-Investigator(Kenkyū-buntansha) |
OHOKA Masataka Kyoto Univ., Dept. of Polym. Chem., 工学部, 教務職員 (10160425)
ITO Shinzaburo Kyoto Univ., Dept. of Polym. Chem. Instructor, 工学部, 助手 (50127049)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1984: ¥4,800,000 (Direct Cost: ¥4,800,000)
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| Keywords | Photoconductive Polymers / Carrier Generation / Energy migration / Carrier Mobility / Excimer-forming Site / Radical Ion Transfer Method / Measurement of Charge Resonance Band / Intramolecular DA Compounds / 光電導性 / キャリヤー生成機構 / エネルギー移動 / エキシトンの拡散 / 分子内光電子移動 / キャリヤー移動度 |
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| Research Abstract |
This investigation aimed at the molecular design of new photo- and electro-functional polymers, i. e., photoconductive polymers and the analysis of their characteristics. The main results are summarized in the following three items.
1. Elucidation of carrier generation mechanism(1)Excimer formation and excited energy migration in polymer films : we found that excimer-forming sites act as energy-traps in polymer films. After serveying various polymers, we found that poly((9-carbazolyl)ethyl methacrylate)has no excimer-forming site and that it becomes a good polymer medium for excitation energy migration. (2)Photoionization of aromatic molecules in polymer solids : we studied both the photoionization of aromatic molecules in polymer matrices through two-photon excitation and the photoionization of donor-spacer-acceptor molecules through one photon excitation in polymer solids. We found that in the former case poly(methyl methacrylate)has a weak electron accepting ability and traps the electrons ejected through two-photon excitation and in the latter case photoionization efficiency depends on the length of spacer chains.
2. Elucidation of carrier transport mechanism We found that excimer forming sires act as carrier-trap sites, nd by reducing the number of excimer forming sites, , could prepare the system having a high carrier mobility of ca. 10^<-5>cm^2V^<-1>s^<-1>.
3. Estimate of the stabilization energy of the radical ions Produced by photochemical electron transfer For the estimate of the stabilization energies of the radical ions, we developed two methods : "radical ion transfer method" and "measurement of charge resonance band". Using these techniques we evaluated the stabilization energies of radical ions produced in polymer chains.
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