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Homopolymerization of Methyl Methacrylate by Novel Ziegler‐Natta‐Type Catalysts Based on Bis(chelate)‐nickel(II) Complexes and Methylaluminoxane
Author(s) -
Carlini Carlo,
Martinelli Marco,
Passaglia Elisa,
Raspolli Galletti Anna Maria,
Sbrana Glauco
Publication year - 2001
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(20010601)22:9<664::aid-marc664>3.0.co;2-k
Subject(s) - methylaluminoxane , nickel , catalysis , polymer chemistry , chelation , methyl methacrylate , natta , polymerization , chemistry , materials science , inorganic chemistry , metallocene , organic chemistry , polymer
Novel catalytic systems based on bis‐(chelate)nickel(II) precursors, such as bis( α ‐nitroacetophenonate)nickel(II) [Ni(naph) 2 ] and bis(2,6‐diisopropylbenzenesalicylaldiminate)nickel(II) [Ni(dipbs) 2 ], and methylaluminoxane (MAO) as the cocatalyst were employed for the polymerization of methyl methacrylate (MMA). Reaction parameters were examined. Under proper conditions, the Ni(dipbs) 2 /MAO system allowed to obtain poly(MMA) with a very high productivity (TOF up to 70 000 h –1 ) and a remarkable syndiospecificity degree ( rr > 80%) at room temperature without addition of an ancillary Lewis base.