2002 Fiscal Year Final Research Report Summary
Synthesis and characterization of nonaromatic polyimides with a polyalicyclic structure
| Project/Area Number |
12650890
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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 |
高分子構造・物性(含繊維)
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| Research Institution | Tokyo Institute of Polytechnics |
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Principal Investigator |
MATSUMOTO Toshihiko Tokyo Institute of Polytechnics, Faculty of Engineering Professor, 工学部, 教授 (50181780)
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| Project Period (FY) |
2000 – 2002
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| Keywords | polyimides / non-aromatic polyimide / polyalicyclic structure / aliphatic polyimides / dielectric constants / refractive index / alicyclic polyimide / colorless polyimide |
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| Research Abstract |
It has become theoretically apparent that the coloration in aromatic polyimides is attributable to a intramolecular charge transfer from the semi-empirical molecular orbital calculations for the model compounds. Several new tetracarboxylic dianhydrides bearing an alicyclic structure were synthesized by a Diels-Alder reaction and the Pd-catalyzed dimethoxycarbonylation reaction. Semi-aromatic or fully alicyclic polyimide films were prepared from the dianhydrides and aromatic or alicyclic diamines by two step polycondensation method. These films were colorless, and the transparencies in the visible region were over 85%. The films remained colorless up to 300℃ when heated in air, and 400℃ in N_2. The semi-aromatic polyimides had an average refractive index range of 1.599 to 1.617, and the birefringencies were lower than 0.017. The fully alicyclic polyimide films showed a cut-off wavelength shorter than 235 nm. The average refractive index of the PI(BHDA-BBH) polyimide film was 1.522, and the birefringence was nearly zero. The dielectric constant estimated from the refractive index was 2.55.
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