| ~(13)C-NMR研究高全同立构聚丙烯的立构缺陷 |
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| 引用本文： | 朱善农,杨小震.~(13)C-NMR研究高全同立构聚丙烯的立构缺陷[J].高分子学报,1984,0(3):197-201. |
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| 作者姓名： | 朱善农 杨小震 |
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| 作者单位： | 中国科学院化学研究所
(朱善农)，中国科学院化学研究所(杨小震) |
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| 摘 要： | 本文应用γ效应以及Suter-Flory的聚丙烯构象内旋转模型,计算了一组两端全部为全同2单元组(meso),中间为11单元组不同立构缺陷的高全同聚丙烯(IPP)分子链中心甲基碳的相对化学位移。将其与67.8MHz ~(13)C-NMR观测值比较,说明IPP中主要缺陷是孤立的rr,此外还有长间同序列的分子链混合,而不是孤立的rrrr缺陷分布在IPP分子链上。
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| 收稿时间： | 1982-09-07 |
13C-NMR STUDY ON THE STEREOSEQUENCE DEFECTS IN HIGH ISOTACTICITY POLYPROPYLENE |
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| Zhu Shan-nong,Yang Xiao-zhen.13C-NMR STUDY ON THE STEREOSEQUENCE DEFECTS IN HIGH ISOTACTICITY POLYPROPYLENE[J].Acta Polymerica Sinica,1984,0(3):197-201. |
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| Authors: | Zhu Shan-nong Yang Xiao-zhen |
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| Institution: | Institute of Chemistry; Academia Sinica |
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| Abstract: | Chemical shifts relating to methyl carbon of central group in the undecad situated within an otherwise isotactic polypropylene chain were calculated by using Gamma effects, Suter and Flory's rotational polypropylene model. All meso, single, double and tetra racemic (r) defects in the undecad were designed.By comparing the chemical shifts calculated from experimental 67.8 MHz 13C-NMR spectra data indicated that the main stereo-defects are isolated rr triads in predominantly isotactic polypropylene chain and the long rrrr sequence,but do not isolated rrrr pentad distri-buted in the isotactic polypropylene chain. |
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