2006 Fiscal Year Final Research Report Summary
Synthesis and Higher-order Structure of Main-chain Liquid Crystalline Polyolefin
| Project/Area Number |
17350110
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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 |
Polymer/Textile materials
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| Research Institution | Nara Women's University |
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Principal Investigator |
KUROSU Hiromichi Nara Women's University, Graduate School of Humanities and Sciences, Associate Professor, 大学院人間文化研究, 助教授 (20221228)
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| Co-Investigator(Kenkyū-buntansha) |
NAGA Naofumi Sibaura Institute of Technology, Faculty of Engineering, Lecturer, 工学部, 講師 (40314538)
SONE Masato Tokyo Institute of Technology, Precision and Intelligence Laboratory, Associate Professor, 精密工学研究所, 助教授 (30323752)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Main-chain Liquid Crystal / Liquid Crystalline Structure Control / Higher-order Structure |
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| Research Abstract |
Poly (ethylene-co1,5-hexadiene) with the 1,5-hexadiene (HD) content of 1.8, 9.7 and 20.3% were prepared by copolymerization of ethylene and HD involving intermolecular cyclization. Higher-order structures and dynamics of these samples were studied by solid state NMR. The ^<13>C solid state NMR spectra and ^<13>C spin-lattice relaxation time (T_1) of the samples were measured. The methylene peaks of the observed ^<13>C CP/MAS NMR spectra for the all samples are decomposed into three peaks. Three decomposed peaks of the methylene carbon are designated peaks α, β, γ from downfield. For melt-quenched samples with HD content of 9.7 and 20.3%, the highest field peak γ (31.4ppm) shifts lower field as compared with the amorphous polyethylene peak. This shows that the conformation of peak γ is trans rich conformation as compared with that of noncrystalline region of polyethylene in the NMR time scale. Furthermore, the chemical shifts of peak γ of melt-quenched samples with high HD contents show downfield shift. This shows that incorporation of cyclopentane structure into polyethylene chain force to take trans rich conformation of noncrystalline region even in the melt-quenching process.
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Research Products
(11 results)
