| 无规立构聚乙烯醇缩酮环结构13C NMR研究 |
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| 引用本文： | 朱清仁,王守臣,洪昆仑,鲁非,戚嵘嵘,徐广智.无规立构聚乙烯醇缩酮环结构13C NMR研究[J].波谱学杂志,1995,12(1):39-46. |
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| 作者姓名： | 朱清仁 王守臣 洪昆仑 鲁非 戚嵘嵘 徐广智 |
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| 作者单位： | 1. 中国科技大学结构研究开放实验室, 合肥 230026;2. 中国科学院化学研究所, 北京 100080 |
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| 摘 要： | 报道了无规立构聚乙烯醇与丙酮、丁酮缩酮化产物的13C NMR研究结果,发现丙酮的产物(PVKA)主要生成六元环.而丁酮产物(PVKB)除六元环外还有八元、十元环存在,且这3种环上的CH3均是以轴立式构象为主.由13C NMR求得PVKB中相应的3种环的比例分别为36.3%,14.4%,5.8%.反应的平衡常数分别为1.8×10-2、2.03×10-3、2.8×10-4,并讨论了它们对结晶等性能的影响.
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| 关 键 词： | 13C NMR 聚乙烯醇 缩酮化 |
| 收稿时间： | 1994-05-09 |
STUDIES ON THE RING STRUCTURES IN ATACTIC PVA KETALS BY 13C NMR (Ⅰ) |
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| Zhu Qingren, Wang Shouchen,Hang Kunlun, Lu Fei and Qi Rongrng.STUDIES ON THE RING STRUCTURES IN ATACTIC PVA KETALS BY 13C NMR (Ⅰ)[J].Chinese Journal of Magnetic Resonance,1995,12(1):39-46. |
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| Authors: | Zhu Qingren Wang Shouchen Hang Kunlun Lu Fei and Qi Rongrng |
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| Institution: | 1. Structure Research Laboratory, USTC, Hefei 230026;2. Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080 |
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| Abstract: | The ring structures in the ketals obtained from the reactions of atactic PVA with acetone and butanone have ben studied by 13C NMR. It was found that PVAand acetone mainly formed six-member ketal ring. On the contrary, butanone formed eight-and ten-member rings boldes the six-member ring, moreover, the methyl groups were all in axial conformations while the ethyl groups were in equatorial conformations. The concentrations of different hotal rings and the reaction equilibrium constants were also calculated through the 13C NMR data. |
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| Keywords: | ?13)C NMR Polyvinyl alcohol Ketalization |
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