%0 Journal Article
%T 13C-NMR STUDY ON RELATIONSHIP BETWEEN STEREOSTR- UCTURE OF POLY (VINYL ALCOHOL) AND ITS KETALIZATION REACTION<br>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
%A ZHU Qing-ren
%A WANG Shou-chen
%A XU Guang-zhi
%A <br>朱清仁
%A 王守臣
%A 徐广智
%J 高分子学报
%D 1992
%I 
%X 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.
%K 聚乙烯醇
%K 立构规整性
%K 缩酮化
%K NMR
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=6579068328FE643F&jid=15971983683C7643EE80F1CE621DEB60&aid=6401DFA4E843FCDB70CAEFEE7991EBE0&yid=F53A2717BDB04D52&iid=CA4FD0336C81A37A&sid=CA4FD0336C81A37A&eid=5D311CA918CA9A03&journal_id=1000-3304&journal_name=高分子学报&referenced_num=0&reference_num=1