波谱学杂志 ›› 1998, Vol. 15 ›› Issue (2): 109-116.

• 研究论文 • 上一篇    下一篇

乙丙共聚物的13C NMR研究

李三喜1,2, 马瑞春1,2, 张帆1,2   

  1. 1 沈阳化工学院高分子系, 沈阳 110021;
    2 锦州市金城造纸 (集团)有限责任公司职工子弟中学, 锦州 121203
  • 收稿日期:1997-07-22 修回日期:1997-09-30 出版日期:1998-04-05 发布日期:2018-01-13
  • 作者简介:李三喜,男
  • 基金资助:
    国家教委留学回国人员科研经费资助及日本国文部省国际科研合作计划支持项目

13C NMR STUDIES OF ETHYLENE-PROPYLENE COPOLYMERS SYNTHESIZED WITH SUPPORTED ZIEGLER-NATTA CATALYST MADE BY CHEMICAL REACTION METHOD

Li Sanxi1,2, Ma Ruichun1,2, Zhang Fan1,2   

  1. 1 Department of Polymer Science, Shenyang Institute of Chemical Technology, Shenyang 110021;
    2 Jinzhou Jincheng Papermaking Group, Ltd. Jinzhou 121203
  • Received:1997-07-22 Revised:1997-09-30 Online:1998-04-05 Published:2018-01-13

摘要: 研究用化学反应法制备的镁钛系载体高效催化剂合成的乙丙共聚物的13C NMR谱图,提出了无需进行分峰处理,通过将谱图直接分为八个独立的区域,并选取其中受仪器测试条件等影响较小的五个谱区的强度,直接计算此类共聚物序列分布的方法,并分别采用伯努利模型和马尔科夫模型对共聚物的三单元组序列分布进行处理,指出在化学反应法制备的载体催化剂催化的乙丙共聚合扫次末端基效应机理进行,且催化剂活性中心有利于乙丙各自的均聚合.

关键词: 乙丙共聚物, 13C NMR, 序列分布, 伯努利模型, 马尔科夫模型

Abstract: A new characterization method for determining the sequence distribution of ethylene-propylene copolymers, obtained with a supported Ziegler-Natta catalyst made by chemical reaction method, was carried out by 13C NMR spectroscopy. By dividing the 13C NMR spectrum into eight individual regions, triad sequence distribution and composition of EP copolymer were calculated through using fiveintegrals of these regions to avoid the use of the other three condition sensitive regions. Comparison of experimental versus calculated triad distribution points out that the first order Markovian model was more fit to the copolymer sequence distribution and the catalytic active sites are more favorable to ethylene and propylene homopoly merization.

Key words: Ethylene-propylene copolymer, 13C NMR spectroscopy, Sequence distribution, Bernoullian model, Markovian model