Abstract
Sequence distribution in the aromatic polyamide copolymerization with 4,4’-diaminodiphenyl ether, 4,4’-diaminodiphenylsulfone and isophthaloyl chloride in N-methyl-2-pyrrolidone was changed from random to some block distribution by adding tertiary amine such as pyridine and triethylamine into the reaction system. The reaction mechanism was examined by some model reactions to clarify the initial stage of polymerization and following conclusion was derived: As reactivity of amino groups in 4,4’-diaminodiphenyl ether became faster than the diffusion of diacid chloride into the reaction solution with the existence of tertiary amine, 4,4’-diaminodiphenyl ether ⁄⁄ isophthaloyl chloride block segments were quickly formed at the initial stage of polymerization to give copolymers with some block tendency.
