| Project/Area Number |
09650746
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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 |
Composite materials/Physical properties
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MURAKAMI Syozo Institute for chemical research, KYOTO UNIVERSITY Instractor, 化学研究所, 助手 (10260621)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Poly (ethylene naphthalate) / PEN / PET Blend / Crystallization |
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| Research Abstract |
Poly(ethylene 2,6-naphthalate) [PEN] possesses naphthalene rings in its main chain in place of all the bengene rings of poly(ethylene terephthalate) [PET]. Accordingly, PEN has both higher strength and higher glass transition temperature (Tg) than those of PET.Thus, PEN is now utilized for electrical and auto-visual applications such as base films for longplay videotape of high quality and new photographic films of automatic camera. But, unfortunately PEN is more expensive than PET and this has limited its use. One useful approach for combining the attractive economics of PET with the better mechanical and thermal properties of PEN is through blends of the polymers. We had studied physical properties and crystallization by the elongation on the change of PEN contents of the PEN/PET blend films.
The strength of the PEN/PET blend film increased in proportion to PEN contents. From the DSC scan, each sample showed a single Tg except the oriented PEN/PET : 50/50 blend film because the transesterification occurred during the processing to induce miscibility and Tg became higher in proportional to the PEN contents. The starting temperature of crystallization was higher in proportion to PEN contents. But the PEN/PET : 50/50 blend film was the lowest crystallinity and the most slow crystallization rate.
The equatorial intensity profile of WAXD pattern from the oriented amorphous PEN/PET : 50/50 blend film at elevated temperatures showed the better defined crystalline reflection. The peak positions of this intensity profile were to be overlapping from both peak positions of the PEN and PET WAXD intensity. This showed the block structure of the PEN/PET blend.
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