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Evaluation of the dimethylsilyl‐bis(2‐methyl‐4‐phenyl‐1‐indenyl) ligand with group 4 triad metals in propene polymerizations with methylaluminoxane
Author(s) -
Ewen John A.,
Zambelli Adolfo,
Longo Pasquale,
Sullivan Jeffry M.
Publication year - 1998
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/(sici)1521-3927(19980101)19:1<71::aid-marc71>3.0.co;2-j
Subject(s) - methylaluminoxane , tacticity , triad (sociology) , propene , catalysis , polymer chemistry , monomer , copolymer , materials science , metallocene , ligand (biochemistry) , polymerization , polymer , chemistry , organic chemistry , composite material , psychology , biochemistry , receptor , psychoanalysis
Dimethylsilyl‐bis(2‐methyl‐4‐phenyl‐1‐indenyl)MCl 2 (M = Ti, Zr, Hf) complexes in combination with methylaluminoxanes produce isotactic polypropene. The Ti catalysts produce isotactic polypropene which is more stereoregular than that obtained with traditional, heterogeneous catalysts. Zr produces low molecular weight, weakly isotactic waxes at phenomenal rates greater than 32 · 10 6 gPP/[(mol catalyst) · h · (mol/l monomer)]. Hf produces long, softer isotactic chains with good activities.