Abstract: Soluble aromatic polyamides containing phthalazinone moieties were prepared.Those polymers were obtained from the solution polymerization of a new diacid containing phthalazinone moieties with various diamines.The new monomer, 2-(4-carboxyphenyl)-4-(4- carboxyphenoxy) phenyl-1 (2H) phthalazinone (Ⅳ) was synthesized in a two-step reaction sequence.2- (4-Cyanophenyl)-4-(4-cyanophenoxy)phenyl-1 (2H)phthalazinone (Ⅲ) was prepared via the condensation reaction of 4-(4-hydroxyphenyl)-1 (2H) phthalazinone (I) with p-chlorobenzonitrile (Ⅱ).After (Ⅲ) was hydrolyzed, (Ⅳ) was acquired.The synthesized polyamides were characterized by means of viscosimetry, DSC, FT-IR, ¹H NMR and EA.The polyamides have a high glass transition temperature which can be as high as 316 C.The polyamides also have good solubilities in some organic solvents.

Key words: Phthalazinone, Diacid, Diamine, Polyamide, Direct polycondensation