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Copolymerization of ethylene and propylene catalyzed by magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts

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Abstract

Magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts with di-i-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 (r E r P = 1.919), low melting temperatures and low crystallinities (X c < 20%).

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Authors and Affiliations

  1. College of Material Science and Chemical Engineering, Tian** University of Science & Technology, Tian**, 300457, China

    Tao Jiang  (姜涛), Hong-xia Chen & Chen-gang Cao

  2. Department of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318, China

    Tao Jiang  (姜涛), Guo-liang Mao, Wei Du & Deng-fei Wang

Authors
  1. Tao Jiang  (姜涛)
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  2. Hong-xia Chen
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  3. Chen-gang Cao
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  4. Guo-liang Mao
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  5. Wei Du
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  6. Deng-fei Wang
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Corresponding author

Correspondence to Tao Jiang  (姜涛).

Additional information

This work was financially supported by the Program for New Century Excellent Talents in Universities (NCET-07-0142), the Program for New Century Excellent Talents in Heilongjiang Provincial Universities (NCET-06-010), the National Natural Science Foundation of China (No. 20972025) and the Science Foundation of Tian** University of Science & Technology (No. 20090420).

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Jiang, T., Chen, Hx., Cao, Cg. et al. Copolymerization of ethylene and propylene catalyzed by magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts. Chin J Polym Sci 29, 475–482 (2011). https://doi.org/10.1007/s10118-011-1048-4

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  • DOI: https://doi.org/10.1007/s10118-011-1048-4

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