| Project/Area Number |
07455270
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Composite materials/Physical properties
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
YAMAOKA Hitoshi Kyoto University, Polymer Chemistry, Professor, 工学研究科, 教授 (80026004)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMOTO Kozo Kyoto University, Polymer Chemistry, Research Associate, 工学研究科, 助手 (90273474)
MATSUOKA Hideki Kyoto University, Polymer Chemistry, Associate Professor, 工学研究科, 助教授 (40165783)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Cryogenic / Advanced composites / Design of polymer materials |
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| Research Abstract |
The purpose of this study is to accumulate the fundamental information for design and synthesis of advanced composites usable in cryogenic environments, From the results obtained in experiments of the first year, it is suggested that the polymers which are able to change the bond angles of the main chain seem to excel in cryogenic properties. This is partly because, even when their segmental motions are frozen out at cryogenic temperatures, these polymers could undergo deformation, and hence could still be flexible by changing the mainchain bond angles. In the experiments of the second year, the relationship between the crystallinity of polymers and the cryogenic properties was studied. The strength and the elongation at break point of polyphenylene sulfide at 77 K increase with an increase in the degree of crystallinity, In the case of polyethylene naphthalate, however, both mechanical properties at 77 K decrease with increasing the degree of crystallinity. These results indicate that the morphology of polymers greatly affects their cryogenic properties. Several properties of polymer composites are dependent on large number of factors such as resin content, relative flexibility of the matrix system, curing temperature and pressure, cure and post-cure cycle, as well as surface treatment of fibers. These findings offer us the useful information for developing the new type of advanced composites for cryogenic applications.
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