Synthesis of aromatic polymers containing anthrazoline and isoanthrazoline units

Abstract

Abstract The condensation of bisketomethylene monomers with either 4,6‐dibenzoyl‐1,3‐phenylenediamine or 2,5‐dibenzoyl‐1,4‐phenylenediamine catalyzed by acid affords high molecular weight polymers containing the anthrazoline and isoanthrazoline units in the polymer main chain. Base is not an effective catalyst for the production of high molecular weight polymer. The phenyl substitution on the anthrazoline and isoanthrazoline units increases the solubility of these polymers over those in which phenyl substitution is absent. The rodlike character of these polymers, which can be altered by positional isomerism in the chain, has an effect on the solution properties.