Pseudo-tetrablock copolymers with ethylene and a functionalized comonomer

摘要

Pseudo-tetrablock copolymers comprised of ethylene and 5-norbornen-2-yl acetate (1), were synthesized using the initiator system (L~iPr_2)Ni(η~1-CH_2Ph)(PMe_3) (2) [(L~iPr_2) = N-{2,6-dnso-propylphenyl)-2-(2,6-diisopropylphenylimino)propanamide] and 2.5 equivalents of Ni(COD)_2 [bis(l,5-cyclooctadiene) nickel.rnPolymer structures with higher-level architectures, such as block-, multiblock- and tapered copolymers are important for achieving properties not available with linear homopolymers. Controlled polymerization reactions are necessary for achieving these structures, which are a particular challenge for ethylene and functionalized co-monomers.