波谱学杂志 ›› 1995, Vol. 12 ›› Issue (2): 189-194.

• 研究论文 • 上一篇    下一篇

无规立构聚乙烯醇缩酮环结构13C NMR研究Ⅱ.各种环浓度测定与估算

朱清仁1, 鲁非1, 洪昆仑1, 文君1, 王兰1, 徐广智2   

  1. 1. 中国科学技术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
  • 收稿日期:1994-05-15 修回日期:1994-09-05 出版日期:1995-04-05 发布日期:2018-01-17
  • 基金资助:
    国家自然科学基金资助项目

STUDIES ON THE RING STRUCTURES IN ATACTIC PVA KETALS BY 13C NMR Ⅱ.Theorctical Prcdiction and Experimental Determination of Ketal Rings Concentrations

Zhu Qingren1, Lu Fei1, Hong Kunlun1, Wen Jun1, Wang Lan1, Xu Guangzhi2   

  1. 1. Structure Research laboratory, USTC, Hefei 230026;
    2. Institute of Chemistry, The Chinese Academy of Sciences, beijing 1000080
  • Received:1994-05-15 Revised:1994-09-05 Online:1995-04-05 Published:2018-01-17

摘要: 报道了用13C NMR研究不同聚合度无规立构聚乙烯醇与丙酮、丁酮反应所形成缩酮环的结构及浓度,并与理论估算值进行了比较,讨论了实际成环浓度与理论值差别的原因,并根据不同聚合度PVA缩酮化结果发现PVA缩酮化反应存在一个临界聚合度No。

关键词: 13C NMR, 缩酮化, 聚乙烯醇

Abstract: The ring structures in the ketals obtained from the reactions of ketones with atactic PVA with different molecular weights have been studied by 13C NMR, The concentrations of different ketal rings were calculated and compared with the results de-termined by13C NMR, their difference were also discussed. It was found that there ex-ists a critical degree of polylnerization(molecular weight) for PVA to produce certain amount of ketal rings.

Key words: 13C NMR, Ketalization, Polyvinyl alcohol