Polymeric Schiff Bases. VIII. The Synthesis and Evaluation of Polyketanils

The condensation of aryldiketones, Ar′(COCH3)2, with aryldiamines, Ar″(NH2)2,in solution produces yellowish-brick-dust, insoluble polymers. Black tractable polymers are obtained by (1) melt condensation of the diketones with diamines alone, or (2) in the presence of the monomeric azomethines, C6H5CH˭NC6H5 or , or (3) in the presence of aniline and the carbonyl compound, , from which the monomeric azomethines were derived, or by (4) the amine-, (5) the keto-, or (6) the bis-exchange reactions. Continued condensation in nitrogen to 400, 600, and 1176°C yields insoluble, infusible, black polymers whose thermal stabilities closely approximate those of the polymeric Schiff bases.