Combination of 8-aminoquinoline nickel dichloride and Cp₂ZrCl₂ catalysts for ethylene polymerization

Authors: Li Z.¹; Zhu N.¹; Sun W-H.^{1, *}; Shao C.¹; Ke Y.¹; Hu Y.¹; He J.¹

Source: Polymer International, Volume 50, Number 12, December 2001 , pp. 1275-1278(4)

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Abstract:

Polyethylene has been modified and synthesized in situ by a combination of Cp₂ZrCl₂ and 8-aminoquinoline nickel dichloride catalysts with methylaluminoxane co-catalyst. The results indicate that the crystallinity and T_m of polyethylene both decrease with increasing Ni/Zr mol ratio when the Ni catalyst is added first. Oligomers formed by 8-aminoquinoline nickel dichloride within a certain Ni/Zr mol ratio could be completely converted into polymer. Three methods used to introduce catalysts to the reaction system resulted in different products. Polyethylene with the lowest melting point, crystallinity and the highest degree of branching resulted when the Zr catalyst was added after that of the Ni compound.

Keywords: ethylene polymerization; Cp₂ZrCl₂; 8-aminoquinoline nickel dichloride; combination catalysts; in situ modification and polymerization

Language: English

Document Type: Miscellaneous

DOI: http://dx.doi.org/10.1002/pi.810

Affiliations: 1: *

Publication date: 2001-12-01

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