Effect of Polymer Melt Memory as Studied by Nuclear Magnetic Resonance
| Project/Area Number |
13650956
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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 Metropolitan University |
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Principal Investigator |
KIMURA Tsunehisa Graduate School of Engineering, Tokyo Metropolitan University, Professor, 大学院・工学研究科, 教授 (40264593)
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| Co-Investigator(Kenkyū-buntansha) |
YAMATO Masafumi Graduate School of Engineering, Tokyo Metropolitan University, Assistant, 大学院・工学研究科, 助手 (40244420)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | NMR / Magnetic Alignment / Polymer / Molecular Weight Dependence / Structure Formation |
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| Research Abstract |
A high-temperature NMR probe became repaired this year and the in-situ NMR measurements for poly(ethylene oxide) (PEO) and paraffin were carried out during the heating and cooling processes. The PEO sample of Mn=4,600 did not show any difference between the starting powder pattern and the spectrum obtained after heating followed by cooling, indicating no alignment. But the sample of Mn=2,000 exhibited the difference, indicating magnetic alignment.
The spectrum of paraffin starts with a powder pattern typical of a σ_<11>, σ_<22>, σ_<33> system, then changed to σ_<11> = σ_<22> type pattern upon heating. This is due to the phase change to the hexagonal phase. Upon melting, the broad peak changed to a narrow one. During the cooling process, the melt passes through a hexagonal phase at which the magnetic alignment was indicated by the reduction of the high-field σ_<33> component. This means that the chain (33 direction) aligned perpendicular to the magnetic field. This is consistent with the previous results by X-ray.
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Report
(3 results)
Research Products
(3 results)
