Synthesis, characterization and properties of poly(aryl ether amides) containing methoxy substituted phthalazinone moiety

A novel aromatic diamine, 2-(4-aminophenyl)-4-[3-methoxy-4-(4-aminophenoxy) phenyl]-2,3-phthala-zin-l-one (OO-DA), polymerized with three aryl dicarboxylic acids to prepare a series of new aromatic polyamides by Yamazaki phthosphorylation method. The structure of polymers obtained was confirmed by FT-IR and 1H-NMR, which were consistent with the designed structure. The synthesized polymers have a high inherent viscosities in the 0.89-1.03 dl/g. They exhibit high glass transition temperature of 281-307°C, good thermostability with 5% mass loss temperature above 440°C and more 55wt% residual mass at 800°C in nitrogen atmosphere. All polyamides are readily soluble in polar solvents such as NMP, DMAc etc. The polyamide films have tensile strength 69-93 MPa, tensile modulus 1.49-1.78 GPa, elongation at break 8.65%-9.47%. The volume electrical resistant coefficient are above 10 15 Ω · cm.