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

Abstract

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, R_p, [C^*], k_p, k_tr 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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FAN Zhi-qiang, FENG Lin-xian, YANG Shi-lin . Plurality of Active Centers on Heterogeneous Ziegler-Natta Catalysts (Ⅱ)——Kinetic Parameters of Four Kinds of Active Centers[J]. Chem. J. Chinese Universities, 1992, 13(1): 137.

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

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