2000 Fiscal Year Final Research Report Summary
Relations between microscopic crosslinking structure and heterogeneity of physical gels and macroscopic properties.
| Project/Area Number |
10305070
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| Research Category |
Grant-in-Aid for Scientific Research (A).
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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 | KYUSHU UNIVERSITY |
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Principal Investigator |
NEMOTO Norio Interdisciplinary Graduate School of Engineering Sciences, KYUSHU UNIVERSITY, Prof., 大学院・総合理工学研究院, 教授 (90027053)
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| Co-Investigator(Kenkyū-buntansha) |
TAKADA Akihiko Interdisciplinary Graduate School of Engineering Sciences, KYUSHU UNIVERSITY, Res. Associate, 大学院・総合理工学研究院, 助手 (20254427)
SHIOKAWA Kozoh Interdisciplinary Graduate School of Engineering Sciences, KYUSHU UNIVERSITY, Associate Prof., 大学院・総合理工学研究院, 助教授 (70089928)
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| Project Period (FY) |
1998 – 2000
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| Keywords | Infrared Dichroism / Physical Gel / Polymer Film / Spherulite / Polypropylene / Elongation / Crystalline Polymer / Deformation Mechanism |
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| Research Abstract |
We designed an infrared spectrometer for dichroism measurement under microscopic scope of 10 μ m size during elongation of samples of gels or films in order to observe molecular motions responding to stimulus of elongational deformation.
We measured infrared dichroism change with elongation for two types of polyethyelene gels with different type of crosslink regions of microcrystallite. One is a swelling gel prepared by swelling the film in tetralin as solvent. The other is a solution gel prepared by gradually cooling a solution obtained by heating the swelling gel. The swelling gel deformed by two steps ; In first step, gel deformed by the rotation of crosslink region consisting of lamellae, and in second step crystalline and non-crystalline regions were oriented by elongation. On the other hand, the solution gels deformed by One step, in which crystalline and non-crystalline regions were simultaneously oriented by elongation.
We investigated the deformation behavior of polypropylene fi
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lm including giant spherulites surrounded by microcrystallite region. When elongation proceeded, microcrystallie region was oriented largely while the giant spherulites were scarcely oriented, which means that the spherulite is fairly rigid in comparison with the microcrystalline region. In the microcrystalline region, it almost keeps unoriented state before finishing yield phenomenon and rapidly oriented just after the yield point. And then the orientation gradually proceeded with further elongation. As for the giant spherulite region, in α_ crystals, separation and entanglement of lamellae occurred for each bundles of crystals. α_<mix> crystals did not easily deform because child lamellae prevent from deformation of parent lamellae. β crystal was fragile and entanglement of twisted lamella was easily disentangled by small stress. α crystals were fairly isolated from the microcrystalline region, while β crystals entangled with microcrystalline region and deformation of spherulite in largely influence to the deformation of the system. Less
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