A crank

non-coplanar heteroeyclie aromatic dicarboxylic acid

4-{4-[4-(4-carboxy phenoxy)phenyl] phenyl}-2-(4-carboxy phenyl) phthalazin-1-one (2)

was successfully synthesized by the condensation of bisphenol-like monomer (DHPZ-pP) with p-ehlorobenzonitrile

followed by the alkaline hydrolysis of the intermediate dinitrile compound．A series of 4-biphenyl-4-yl-phthalazinone-based aromatic poly(aryl amide)s were prepared from the diacid 2 and various aromatic diamines by direct phosphorylation polycondensation．The intrinsic viscosities of polymers were in the range of 0.42～0.72 dL/g．Most of the poly(aryl amide)s were quite soluble in polar solvents such as N-methyi-2-pyrrolidone

N

N-dimethylaeetamide and N

N-dimethylsulfoxide．Some of them were even soluble in less polar solvents such as m-cresol and pyridine．The transparent

toush

and flexible films

east from the polymer solutions．possessed a tensile strength in the range of 80～89 MPa

an elongation at break of 6％～13％

and a tensile modulus of 1.59～1.92 GPa．The polymers possessed high thermal stability associated with glass-transition temperatures in the range of 298～328℃ and 10％ weight-loss temperatures in excess of 470℃ in nitrogen.