Chinese Journal of Polymer Science

, Volume 35, Issue 6, pp 739–751 | Cite as

Modification of the (SiO2/MgO/MgCl2)·TiCl x Ziegler-Natta polyethylene catalysts using the third metal elements

Papers

Abstract

Various (SiO2/MgO/MgCl2)·TiCl x Ziegler-Natta catalysts modified by the third metal elements were synthesized by the co-impregnation of water-soluble magnesium and the third metal salts. Several key factors including the electronegativity of the third metal elements, catalyst performances in ethylene homo-polymerization, ethylene/1-hexene copolymerization and hydrogen response were systematically investigated. Both the catalyst performance and the polymer properties are influenced by the introduction of the third metal elements. Compared with the unmodified (SiO2/MgO/MgCl2)·TiCl x Ziegler-Natta catalyst, activity and 1-hexene incorporation are enhanced by the introduction of zirconium, vanadium, aluminum and chromium, while deteriorated by the addition of ferrum, nickel, molybdenum and tungsten. Correlations of the catalyst activities and 1-hexene incorporation ability with the electronegativity of the third metal elements are discovered. It is found that the lower electronegativity of the third metal elements leads to the catalyst with higher activity and higher α-olefin co-polymerization ability. The polyethylene produced by a nickel modified catalyst showed broad molecular weight distribution (MWD) and the lowest average molecular weight (MW), while by using a ferrum modified catalyst, the resulting polyethylene had the highest MW, reaching the ultra-high MW area. Vanadium and chromium modified catalysts demonstrated the best hydrogen response.

Keywords

Polyethylene Ziegler-Natta polymerization Copolymerization Kinetics 

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Supplementary material

10118_2017_1939_MOESM1_ESM.pdf (318 kb)
Modification of the (SiO2/MgO/MgCl2)·TiCl x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

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Copyright information

© Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Chemical EngineeringEast China University of Science and TechnologyShanghaiChina

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