NMR Spectra of polyimides: Interpretation and local chain motion study
文献类型：期刊论文
| 作者 | Wang JL ; Zhang JG ; Li BY ; Ding MX ; Feng ZL |
| 刊名 | macromolecular chemistry and physics
 |
| 出版日期 | 1996 |
| 卷号 | 197期号:2页码:651-666 |
| 关键词 | SPIN RELAXATION DISSOLVED POLYCARBONATES MACROMOLECULES DYNAMICS |
| ISSN号 | 1022-1352 |
| 中文摘要 | three kinds of high-performance polyimides 1 (poly(ketone-imide) pki), 2 (poly(ether-imide) pei) and 3 (poly(oxy-imide) poi) were studied using nuclear magnetic resonance (nmr). the nmr spectra of the polyimides were assigned according to the comprehensive consideration of the substitution effect of different substituting groups, viz. distortionless enhancement by polarization transfer (dept), no nuclear overhauser effect (nne), analysis of relaxation time, and two-dimensional correlated spectroscopy (cosy) techniques. the structural units of these three polyimides were determined. carbon-13 and proton relaxation times for pei and pki were interpreted in terms of segmental motion characterized by the sharp cutoff model of jones and stockmayer (js model) and anisotropic group rotation such as phenyl group rotation and methyl group rotation. correlation times for the main-chain motion are in the tens of picosecond range which indicates the high flexibility of polyimide chains. correlation times for phenyl group and methyl group rotations are more than 1 order of magnitude lower and approximately 1 order of magnitude higher than that of the main chain, respectively. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| 公开日期 | 2010-12-22 ; 2011-06-09 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/25599]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang JL,Zhang JG,Li BY,et al. NMR Spectra of polyimides: Interpretation and local chain motion study[J]. macromolecular chemistry and physics,1996,197(2):651-666. |
| APA | Wang JL,Zhang JG,Li BY,Ding MX,&Feng ZL.(1996).NMR Spectra of polyimides: Interpretation and local chain motion study.macromolecular chemistry and physics,197(2),651-666. |
| MLA | Wang JL,et al."NMR Spectra of polyimides: Interpretation and local chain motion study".macromolecular chemistry and physics 197.2(1996):651-666. |
入库方式： OAI收割
来源：长春应用化学研究所
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