This paper describes a new series of polyphenylquinozaline (PPQ). The starting material

para-bis(p-chlorophenylg!yoxaloyl)benzene(CPGB) was prepared via Grignard reaction. Chlorinated polyphenylquinoxaline was then obtained through cyclocondensa-tion reaction of 3

3'-diaminotenzidine(DAB) and 3

3'

4

4'-tetramino-diphenyl ether (TAPE) with CPGB. They have higher T

than that of PPQ itself. Block and random copolymers of PPQ were prepared by the reaction of DAB and TAPE with 1

4-bis(phenylgloxaloyl) benzene (PGB) in m-cresol at room temperature. These poly-mers and copolymers exhibit higher thermoxidative stability

and excellent high-temperature resistance even in the presenceof water.