Tacticity Distributions of Polypropylene Prepared with Supported Ziegler-Natta Catalysts

Abstract

Abstract: Polypropylene samples prepared with supported Ziegler-Natta catalysts were fractionated with temperature rising elution fractionation(TREF) technique and the tacticity distributions were obtained. It is found that the polypropylene sample has a broad tacticity distribution when there exists no electron donor in the catalyst. the mutiple maximal w_i(%)/At values indicates the presence of plural active sites in the catalysts. Experimental results show that both external and internal electron donors can narrow the tacticity distribution of PP.When external and internal electron donors are present in the catalysts, the obtained PPhas the narrowest tacticity distribution.

Key words: Ziegler-Natta catalyst, Polypropylene, Fractionation

CLC Number:

O632.12

TrendMD:

XU Jun-Ting, FENG Lin-Xian, YANG Shi-Lin. Tacticity Distributions of Polypropylene Prepared with Supported Ziegler-Natta Catalysts[J]. Chem. J. Chinese Universities, 1997, 18(10): 1734.

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Tacticity Distributions of Polypropylene Prepared with Supported Ziegler-Natta Catalysts

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