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Effective activation of metallocene catalysts with supported‐type Ph 3 CClO 4 in ethylene polymerization
Author(s) -
Kishi Naoya,
Ahn CheolHee,
Jin Jizhu,
Uozumi Toshiya,
Sano Tsuneji,
Soga Kazuo
Publication year - 2000
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20000701)21:11<775::aid-marc775>3.0.co;2-c
Subject(s) - metallocene , ethylene , catalysis , polymerization , polymer chemistry , post metallocene catalyst , materials science , polymer science , chemistry , chemical engineering , organic chemistry , polymer , engineering
Supported type cocatalysts using triphenylcarbenium perchlorate (Ph 3 CClO 4 ) were prepared by impregnation on inorganic carrier, magnesium chloride (MgCl 2 ) and applied to ethylene polymerizations with rac ‐Et[Ind] 2 ZrCl 2 . Homogeneous polymerizations with Ph 3 CClO 4 were also carried out for comparison. The activity of homogeneous polymerization was much lower than that obtained with methylaluminoxane (MAO). On the other hand, rac ‐Et[Ind] 2 ZrCl 2 activated by the supported type Ph 3 CClO 4 /MgCl 2 system displayed high activity comparable to that obtained with MAO. From the results of fractionation and polymerization of the rac ‐Et[Ind] 2 ZrCl 2 ‐Ph 3 CClO 4 /MgCl 2 catalyst system, it was found that the increased activity mainly came from the active species in the supernatant part. UV‐vis spectroscopic measurements combined with ICP analysis indicate that the active species in the supernatant fraction are composed of a stoichiometric amount of perchlorate and metallocene catalyst.