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Synthesis of Novel Bis(β‐enaminoketonato)titanium Catalyst with High Activity and Excellent Ability to Copolymerize Olefins
Author(s) -
Yang Guofan,
Hong Miao,
Li Yuesheng,
Yu Shijun
Publication year - 2012
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.201200350
Subject(s) - methylaluminoxane , copolymer , ethylene , catalysis , polymer chemistry , norbornene , polymerization , chemistry , titanium , ligand (biochemistry) , trifluoromethyl , metallocene , organic chemistry , polymer , alkyl , receptor , biochemistry
A new titanium complex [PhN=C(Ph)CHC(CF 3 )O] 2 TiCl 2 (2a), with an asymmetric β‐enaminoketonato [N,O] ligand, has been synthesized and fully characterized. With modified methylaluminoxane as a cocatalyst, the behaviors of ethylene polymerization, and ethylene/α‐olefin and ethylene/norbornene copolymerization have been explored in detail. Relative to its regioisomer 2b ([PhN=C(CF 3 )CHC(Ph)O] 2 TiCl 2 ), the present catalyst exhibits significant predominance. The catalytic activity in 2a‐catalyzed homo‐ and copolymerization are much higher than those in 2b‐catalyzed (co)polymerization. Furthermore, compared with 2b, catalyst 2a possesses an obviously stronger ability towards copolymerization, due to a wide coordination space caused by exchanging the position of the phenyl group and trifluoromethyl group on the framework.