高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (1): 137.

• 论文 • 上一篇    

异相Ziegler-Natta催化剂的活性中心多分散性(Ⅱ)——4种活性中心的聚合动力学参数

范志强, 封麟先, 杨士林   

  1. 浙江大学化学系, 杭州, 310027
  • 收稿日期:1991-05-11 出版日期:1992-01-24 发布日期:1992-01-24
  • 通讯作者: 封麟先
  • 基金资助:

    国家自然科学基金

Plurality of Active Centers on Heterogeneous Ziegler-Natta Catalysts (Ⅱ)——Kinetic Parameters of Four Kinds of Active Centers

FAN Zhi-qiang, FENG Lin-xian, YANG Shi-lin   

  1. Department of Chemistry, Zhejiang University, Hangzhou, 310027
  • Received:1991-05-11 Online:1992-01-24 Published:1992-01-24

摘要: 测定了络合Ⅱ型TiCl3-Al(C2H5)3催化1-辛烯聚合中不同时间的产物分子量分布,用4个Schulz-Flory“最可几”分布函数叠加,较好地拟合了实测分布,从而确定此体系有4种活性中心。从拟合及动力学测定结果确定了4种活性中心的聚合速率、浓度及链增长速率常数、链转移速率常数等,讨论了各活性中心的结构及聚合机理。

关键词: Ziegler-Natta催化剂, 活性中心, 多分散性, 动力学参数

Abstract: The molecular-weight distribution (MWD) of polyoctene-1 synthesized by Complex- II TiCl3-AlEt3 catalyst was determined, and the MWD curves were precisely fitted by four Schulz-Flory "most probable" distributions with different parameters, indicating the pres-ence of four kinds of active center in the studied system.By using of the results of MWDanalysis and polymerization kinetics measurements, Rp, [C*], kp, ktr and other parameters of the four kinds of active center were determined.The structures of the active centers and the polymerization mechanism are discussed.

Key words: Ziegler-Natta catalyst, Active center, Plurality, Kinetic parameters

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