Synthesis of methyl acrylate graft copolymers by the combination of a polynorbornene containing pendant vinylbenzene groups by using coordination and reverse atom transfer polymerization

摘要

Copolymerization of norbornene and 1,4-divinylbenzene was successfully performed using a β-ketoamine chelate nickel complex-methylaluminoxane, yielding random copolymer of norbornene and 1,4-di vinylbenzene containing a few pendant styrene groups. With the initiation of copper dichloride and 2,2-azobisisobutyronitrile, the pendant styrene groups were quantitatively polymerized with methyl acrylates, which allowed the successful synthesis of polynorbornene-based graft copolymers by reverse atom transfer radical polymerization mechanism. The analyses of the product by ~1H NMR and gel permeation chromatography gave the verification of 'true' copolymer. The thermal property of the graft copolymer was controlled by varying the monomer feed ratio.