| 13C-NMR研究聚乙烯醇微观立构规整性与丙酮缩酮化反应的关系 |
| |
| 引用本文： | 朱清仁,王守臣,徐广智.13C-NMR研究聚乙烯醇微观立构规整性与丙酮缩酮化反应的关系[J].高分子学报,1992,0(1):1-8. |
| |
| 作者姓名： | 朱清仁 王守臣 徐广智 |
| |
| 作者单位： | 中国科技大学结构中心; 中国科学院化学研究所 |
| |
| 摘 要： | 本文利用丙酮与聚乙烯醇(PVA)链OH侧基之间的反应,制备出缩桐环含量不同(<70mol％)的缩酮化产物(PVKT).通过22.5 MHz 13C-NMR谱对其微观链结构进行表征.研究了反应与PVA空间立构性间的关系.将缩酮环划分为MM-cis、MR-cis及RR-trans三种主要构型,得到相应反应平衡常数K和初始反应速率R,并探讨了它们之间的关系: Kmm>>Kmr>Krr,Rmm>Rmr>Rrr
|
| 关 键 词： | 聚乙烯醇 立构规整性 缩酮化 NMR |
| 收稿时间： | 1990-02-08 |
13C-NMR STUDY ON RELATIONSHIP BETWEEN STEREOSTR- UCTURE OF POLY (VINYL ALCOHOL) AND ITS KETALIZATION REACTION |
| |
| ZHU Qing-ren,WANG Shou-chen,XU Guang-zhi.13C-NMR STUDY ON RELATIONSHIP BETWEEN STEREOSTR- UCTURE OF POLY (VINYL ALCOHOL) AND ITS KETALIZATION REACTION[J].Acta Polymerica Sinica,1992,0(1):1-8. |
| |
| Authors: | ZHU Qing-ren WANG Shou-chen XU Guang-zhi |
| |
| Institution: | Center for Structure and Elemented Alalysys China University of Science and Technology; Hefei; Post code: 230026; Institute of Chemistry; Academia Sinica; Beijing; Post code: 100080 |
| |
| Abstract: | Through reaction between the hydroxy groups of poly(vinyl alcohol) (PVA) and acetone, various polyvinyl ketal copolymers (PVKT) containing <70% ketal ring-units in the products were obtained. The relationship between tacticity of PVA, rate of ketalization reaction and structural characterization were carried on PVKT by13C-NMR spectroscopy at 22.5 MHz. Ketal rings in partly ketaled PVA were assigned into MM-cis, MR-cis and RR-trans types, and corresponding equilibrium constants Kmm, Kmr, Krr, and rate of ketalization reaction were discussed. |
| |
| Keywords: | |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《高分子学报》浏览原始摘要信息 |
| 点击此处可从《高分子学报》下载免费的PDF全文 |
|
