Novel catalytic systems based on bis(chelate)nickel(II)) precursors, such as bis(alpha -nitroaceto-phenonate)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 lip to 70000 h(-1) and a remarkable syndiospecificity degree (rr > 80%) at room temperature without addition of an ancillary Lewis base.
Homopolymerization of methyl methacrylate by novel Ziegler-Natta-type catalysts based on bis(chelate)-nickel(II) complexes and methylaluminoxane
CARLINI, CARLO;MARTINELLI, MARCO;RASPOLLI GALLETTI, ANNA MARIA;SBRANA, GLAUCO
2001-01-01
Abstract
Novel catalytic systems based on bis(chelate)nickel(II)) precursors, such as bis(alpha -nitroaceto-phenonate)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 lip to 70000 h(-1) and a remarkable syndiospecificity degree (rr > 80%) at room temperature without addition of an ancillary Lewis base.File in questo prodotto:
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