Citation: Tao Jiang, Hong-xia Chen, Chen-gang Cao, Guo-liang Mao, Wei Du, Deng-fei Wang. COPOLYMERIZATION OF ETHYLENE AND PROPYLENE CATALYZED BY MAGNESIUM CHLORIDE SUPPORTED VANADIUM/TITANIUM BIMETALLIC ZIEGLER-NATTA CATALYSTS[J]. Chinese Journal of Polymer Science, ;2011, 29(4): 475-482. doi: 10.1007/s10118-011-1048-4 shu

COPOLYMERIZATION OF ETHYLENE AND PROPYLENE CATALYZED BY MAGNESIUM CHLORIDE SUPPORTED VANADIUM/TITANIUM BIMETALLIC ZIEGLER-NATTA CATALYSTS

Received Date: 6 July 2010
Revised Date: 16 August 2010

Magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts with di-em-butyl phthalate as internal donor for copolymerization of ethylene and propylene were prepared. The effects of reaction temperature, ethylene/propylene molar ratio, aluminium/vanadium (Al/V) molar ratio and titanium/vanadium molar ratio on the catalytic activity were investigated. The molecular weight, molecular weight distribution, sequence composition and crystallinity of the products were measured by gel permeation chromatography, 13C-NMR and differential scanning calorimetry analysis, respectively. In comparison to the vanadium and titanium catalysts, the bimetallic catalyst showed higher catalytic activity and better copolymerization performance. The obtained ethylene/propylene copolymers have high molecular weight(105), broad molecular weight distribution, high propylene content with random or short blocked sequence structures(rErP = 1.919), low melting temperatures and low crystallinities (Xc 20%).
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