| Project/Area Number |
08455308
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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 | Tokyo Institute of Technology |
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Principal Investigator |
KIKUTANI Takeshi Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Associate Professor, 工学部, 助教授 (70153046)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Hiroshi Tokyo Institute of Technology, Department of Organic and Polymeric Materials, As, 工学部, 助手 (20259807)
SHIOYA Masatoshi Tokyo Institute of Technology, Department of Organic and Polymeric Materials, As, 工学部, 助教授 (10196363)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥4,800,000 (Direct Cost: ¥4,800,000)
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| Keywords | melt spinning / sheath-core type bicomponent fibers / fiber-reinforced thermoplastic composites / structural gradient / tensile modulus / poly (ethylene terephthalate) / polypropylene / liquid crystalline polymer |
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| Research Abstract |
Sheath-core type bicomponent fibers consisting of polypropylene (PP) or poly (ethylene terephthalate) as a sheath component and thermoplastic liquid crystalline polymer (TLCP) as a core component were prepared by the high-speed melt spinning process. Continuous fiber reinforced thermoplastic composites, in which TLCP act as a reinforcing fiber and PP or PET as a matrix polymer, were fabricated by the compression molding of these fibers. In the melt spinning, the attainable highest take-up velocity of TLCP was improved by co-processing with PP or PET.Tensile modulus and strength of the TLCP component in the PP/TLCP and PET/TLCP bicomponent fibers increased with an increase in the take-up velocity. Comparison of the wide-angle X-ray diffraction patterns of starting bicomponent fibers and fabricated composites indicated that the niticeable orientation relaxation of TLCP did not occur in the compression molding process. Accordingly, the tensile modulus and strength of the PP/TLCP and PET/TLCP composites were similar to those of the respective bicomponent fibers. Continuous fiber reinforced thermoplastic composites with various types of structural gradient were fabricated from the bicomponent fibers prepared by gradually changing the sheath-core composition in the spinning process. In the three-point bending test of a composite with asymmetric structural gradient in the thickness direction, the yielding behavior and maximum flexural load varied but initial flexural modulus did not vary depending on the direction of load application. Composites with symmetric structure but two different types of structural gradient, one in which TLCP content is higher near the surfaces and lower in the core and the other in which TLCP content is lower near the surfaces and higher in the center, were prepared. These composites exhibited different initial modulus and yielding behavior even though the TLCP content is similar.
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