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Ethylene polymerizations with disiloxane‐bridged indenyl and cyclopentadienyl metallocene catalysts
Author(s) -
Wang Baiquan,
Su Liming,
Xu Shansheng,
Feng Ru,
Zhou Xiuzhoug,
He Dawei
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021981017
Subject(s) - methylaluminoxane , cyclopentadienyl complex , metallocene , polymer chemistry , polyethylene , disiloxane , ethylene , polymerization , zirconium , chemistry , post metallocene catalyst , materials science , catalysis , organic chemistry , polymer
ansa ‐Tetramethyldisiloxane‐bridged indenyl, tetrahydroindenyl and cyclopentadienyl zirconium complexes 1 – 4 were prepared. The pure rac ‐ 1 – 3 and meso ‐ 1 – 2 complexes were separated by fractional crystallization. Indenyl complexes, both rac ‐ 1 and meso ‐ 1 , in the presence of methylaluminoxane (MAO), have very high activities for ethylene polymerization. The molecular weight of polyethylene produced with rac ‐ 1 is extremely high and significantly dependent on polymerization temperature. The tert ‐butyl‐substituted cyclopentadienyl complex exhibits low activity and produces polyethylene of low molecular weight.