Copolymerization of ethylene and 1-octene catalyzed by a modified Ziegler-Natta catalyst

KONG Yuan1;YI JianJun2;HUANG QiGu1;GAO KeJing2;ZHANG MingGe2;YANG WanTai1

Journal of Beijing University of Chemical Technology ›› 2011, Vol. 38 ›› Issue (5) : 56-62.

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Journal of Beijing University of Chemical Technology ›› 2011, Vol. 38 ›› Issue (5) : 56-62.
材料科学与工程

Copolymerization of ethylene and 1-octene catalyzed by a modified Ziegler-Natta catalyst

  • KONG Yuan1;YI JianJun2;HUANG QiGu1;GAO KeJing2;ZHANG MingGe2;YANG WanTai1
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Abstract

A novel modified supported Ziegler-Natta catalyst(n-BuO)TiCl3/MgCl2has been prepared and employed for ethylene/1-octene copolymerization, with AlEt3 as cocatalyst. The influence of varying the polymerization temperature, the Al/Ti molar ratio, the feed molar ratio of ethylene to 1-octene and the ethylene pressure on the copolymerization reaction were investigated. The structure, properties and morphology of the copolymer were characterized by 13C-NMR, GPC, DSC and SEM. It was found that the catalytic activity in ethylene/1-octene copolymerization of the modified Ziegler-Natta catalyst was higher than that of the traditional Ziegler-Natta catalyst. The Al/Ti molar ratio and the feed molar ratio of ethylene to 1-octene have obvious effects on the catalytic activity, the comonomer content within the copolymer chain, the molecular weight and molecular weight distribution, and the microstructure of the resulting copolymer. Compared with the traditional Ziegler-Natta catalyst for ethylene/1-octene copolymerization which gives a comonomer content of 0.34%, the modified Ziegler-Natta catalyst showed higher activity for ethylene/1-octene copolymerization, and the comonomer content within the copolymer chain reached as high as 2.26 mol%. The microstructure of the copolymer was determined and the reactivity ratios of the monomers were confirmed by 13C-NMR. Values of rE=55.00 for ethylene and rO=0.023 for 1-octene with rE· rO=1.27 were obtained, suggesting the tendency for random distribution of the comonomers within the copolymer chain.

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KONG Yuan1;YI JianJun2;HUANG QiGu1;GAO KeJing2;ZHANG MingGe2;YANG WanTai1
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Copolymerization of ethylene and 1-octene catalyzed by a modified Ziegler-Natta catalyst[J]. Journal of Beijing University of Chemical Technology, 2011, 38(5): 56-62

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