Synthesis and characterization of poly(ether amide)s containing phthalazinone moieties

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, H-1 NMR and EA. The polyamides have a high glass transition temperature which can be as high as 316 degrees C. The polyamides also have good solubilities in same organic solvents.