Nuclear magnetic resonance relaxation of cohesional entanglement of nylon 6 chains in trifluoroacetic acid solution
文献类型：期刊论文
| 作者 | Gao, HC; Mao, SZ; Yuan, HZ; Du, YR |
| 刊名 | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
 |
| 出版日期 | 2004-08-01 |
| 卷号 | 25期号:8页码:1555-1558 |
| 关键词 | cohesional entanglement NMR relaxation time nylon 6 hydrogen bond |
| 英文摘要 | An unambiguous assignment of the main H-1 NMR resonance of nylon 6 in trifluoroacetic acid TFA solution was carried out by using a combination of 1D and 2D NMR heteronuclear technique (HMQC). The spin-spin relaxation time measurements at different temperatures provide the information about cohesional entanglements of main chains among the macromolecules and the dynamics of nylon 6 polymer at different temperatures in TFA solution. The results show that the methylene groups of the nylon 6 main chains are coliesionally entangled in different degrees at the ambient temperature. The farther the methylene group from the CO and NH groups, the more intensely entangled they are. The entanglements of the methylene groups adjacent to the CO and NH groups, are less pronounced owning to the formation of interchain hydrogen bonds. These entanglements are gradually weakened by the thermal motion upon increasing temperature. The absence of the variation in t(2H) Of the NH proton with the charge of temperature and the decrease in t(2H) Of the TFA protons with the increase in temperature give an evidence about the dissociation of the interchain hydrogen bonds among the nylon 6 molecules and the formation of hydrogen bonds between TFA protons with the NH and CO groups of nylon 6 set free by increasing temperature. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Multidisciplinary |
| 研究领域[WOS] | Chemistry |
| 关键词[WOS] | CONCENTRATED CYCLOHEXANE SOLUTION ; END-GROUP ; NMR ; POLYSTYRENE ; C-13 ; DISENTANGLEMENT ; POLYAMIDE-6 ; BEHAVIOR ; PROPERTY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000223524600045 |
| 公开日期 | 2015-07-28 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/4440]  |
| 专题 | 武汉物理与数学研究所_2011年以前论文发表（包括2011年） |
| 作者单位 | Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, HC,Mao, SZ,Yuan, HZ,et al. Nuclear magnetic resonance relaxation of cohesional entanglement of nylon 6 chains in trifluoroacetic acid solution[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2004,25(8):1555-1558. |
| APA | Gao, HC,Mao, SZ,Yuan, HZ,&Du, YR.(2004).Nuclear magnetic resonance relaxation of cohesional entanglement of nylon 6 chains in trifluoroacetic acid solution.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,25(8),1555-1558. |
| MLA | Gao, HC,et al."Nuclear magnetic resonance relaxation of cohesional entanglement of nylon 6 chains in trifluoroacetic acid solution".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 25.8(2004):1555-1558. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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