Development of a super-high magnetic-field gradient pulsed NMR probe and its applications to polymer condensed systems
| Project/Area Number |
07555297
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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 | 試験 |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NOSE Takuhei Tokyo Institute of Technology Polymer Chemistry Professor, 工学部, 教授 (20016405)
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| Co-Investigator(Kenkyū-buntansha) |
HIGUCHI Keiichiro JEOL Ltd.General Manager, 研究開発部, 主任研究員
IKEDA Takiyoshi JEOL Ltd. General Manager, 分析器機サービス部, 専門次長研究員
INOMATA Katsuhiro Tokyo Institute of Technology Polymer Chemistry Research Associate, 工学部, 助手 (80232578)
ANDO Isao Tokyo Institute of Technology Polymer Chemistry Professor, 工学部, 教授 (20016637)
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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 |
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 1996: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1995: ¥7,500,000 (Direct Cost: ¥7,500,000)
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| Keywords | Pulsed-field gradient spin-echo / NMR / Diffusion / Polymer condensed systems |
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| Research Abstract |
We succeeded in constructing a new NMR probe which could generate high magnetic-field gradient being up to 2000G/cm. Specifications of the probe are as follows. Pulse width : 0.6ms-20ms ; pulse interval : 600ms ; pulse sequence : Hahn echo method ; diameter of sample tube : 5mm. Applying the probe for studies of complex polymer systems, we obtained the following results : (1) Self-diffusion coefficients of poly (ethylene glycol) (PEG) dissolved in swollen. poly (N,N-dimethylacrylamide) gels were measured. It was found that the diffusion coefficient exponentially decreases with increasing the chain dimension of PEG scaled by the hydrodynamic screening length of the matrix gel. (2) The self-diffusion coefficient of PEG-(oleyl ether) dissolved incopolymer solutions of N,N-dimethylacrylamide/ (stearyl itaconic acid) showed that the translation diffusion is slowed down, while the segmental motion of the PEG is not affected, by micellar formation of the probe polymer with the matrix polymer. (3) The self-diffusion coefficient of poly (diethylsiloxane) in bulk is discontinuously decreasedat the transition from a liquid crystalline meso-phase to isotropic phase with increasing temperature. (4) Diblock copolymer solutions of polystirene/poly (dimethylsiloxane) in selective poor solvents were found to exhibit complex phase behavior by means of static and dynamic light scattering. Combining self-diffusion measurements with dynamic light scattering will promisingly provide important information for the phase behavior because there occurs intermolecular associations in the solutions, although the measurements are about to be carried out.
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Report
(3 results)
Research Products
(11 results)
