高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (2): 315.

• 论文 • 上一篇    下一篇

β-二酮或β-三酮对铈(Ⅳ)盐引发烯类单体聚合的影响

赵京波, 丘坤元   

  1. 北京大学化学与分子工程学院, 北京 100871
  • 收稿日期:1995-02-10 出版日期:1996-02-24 发布日期:1996-02-24
  • 通讯作者: 丘坤元
  • 作者简介:赵京波.男,29岁.博士研究生.
  • 基金资助:

    国家自然科学基金

Effect of β-Diketone andβ-Triketone on Vinyl Polymerization Initiated by Ceric Salt

ZHAO Jing-Bo, QIU Kun-Yuan   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
  • Received:1995-02-10 Online:1996-02-24 Published:1996-02-24

摘要: 研究了β-二酮或β-三酮(如:3-苄基乙酰丙酮、苯甲酰基丙酮、二苯甲酰基甲烷及3-苯甲酰基乙酰丙酮)对铈(Ⅳ)盐引发丙烯酰胺聚合的促进作用,测定了聚合反应速度及表现活化能,表明铈(Ⅳ)盐/β-二酮或β-三酮可组成活性很高的氧化还原体系;采用自旋捕捉技术及ESR谱研究了体系的初级自由基结构;通过FTIR光谱端基分析检测到这类体系引发丙烯腈所得聚合物端基有β-二酮结构。以此为基础,提出了这类体系引发烯类单体聚合的机理。

关键词: &beta, -二酮, &beta, -三酮, 铈(Ⅳ)盐, 丙烯酰胺聚合

Abstract: The effect of β-diketone and β-triketone,such as 3-benzy1-2,4-pentanedione(BzyAcAc),benzoylacetone(BzAc),dibenzoylmethane(DBzM) and 3-benzoy1-2,4-pentanedione(BzAcAc),on polymerization of acrylamide(AAM) initiated by ceric ion was investigated.The determination of polymerization rate and overall activation energy showed that theseβ-diketones(orβ-triketone) coupled with ceric ion can form very active redox systems.The structures of free radicals resulting from these systems were monitored by radical trapping technique and ESRspectra,and the β-diketone fragments in polyacrylonitrile initiated by above mentioned systems were detected by means of FTIRspectra end group analysis.The initiating mechanisms of ceric ion/β-diketone(orβ-triketone) systems were proposed.

Key words: β-Diketone, β-Triketone, Ceric salt, Polymerization of acrylamide

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