Ethylene polymerizations with disiloxane‐bridged indenyl and cyclopentadienyl metallocene catalysts | Zendy

Wang Baiquan | Zendy; Su Liming | Zendy; Xu Shansheng | Zendy; Feng Ru | Zendy; Zhou Xiuzhoug | Zendy; He Dawei | Zendy

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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.

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