Nickel complex-mediated copolymerization of regioisomeric 5,5 ′-bis(chlorobenzoyl)-2,2 ′-dimethoxybiphenyls: synthesis of wholly aromatic copolyketones

Abstract

Aromatic coupling copolymerization of 5,5 ′-bis(4-chlorobenzoyl)-2,2 ′-dimethoxybiphenyl ( 1) and 5,5 ′-bis(3-chlorobenzoyl)-2,2 ′-dimethoxybiphenyl ( 2) has successfully afforded higher-molecular-weight polyketones than either of the corresponding homopolymerizations. The wholly aromatic copolyketones thus obtained have highly amorphous nature with high glass transition temperatures ( T g).