Regularly alternating copolymers of aromatic amide and enaminonitrile groups were synthesized by solution polycondensation of diamines containing preformed amide or enaminonitrile groups with m- or p-bis(1-chloro-2,2-dicyanovinyl)benzene or aromatic diacid chlorides, respectively. Most of the copolymers were high molecular weight materials ([eta](DMF) = 1.0-3.1). The copolymers were soluble in proton-accepting solvents and showed high glass transition temperatures in the range 262-320 degrees C. The enaminonitrile groups underwent curing between 300 and 350 degrees C, as do homopoly(enaminonitriles). The thermal stability (air and nitrogen) of the copolymers was good to excellent. In general, the predominantly para-substituted copolymers showed lower thermal stability than the corresponding homopoly(enaminonitriles) and Kevlar, while higher thermal stability was exhibited by the meta-substituted copolymers when compared to Nomex.