Synthesis and properties of polyamides of p‐phenylenedioxydiacetic acid

Several polyamides of p ‐phenylenedioxydiacetic acid (PDDA) were synthesized by the low‐temperature solution polycondensation techniques. Six different diamines were condensed independently with p ‐phenylenedioxydiacetyl chloride (PDC) in a mixture of N ‐methyl pyrolidone (NMP) and hexamethyl phosphoramide (HMPA). The polymers were obtained in 80–95% yield and possessed inherent viscosities in the range 0.32–0.81 dL/g. The polymers were characterized by infrared (IR) and H 1 ‐NMR spectra. The solubility, density, crystallinity, and thermal stability of the polyamides were also determined. A model diamide (MDA‐1) was also synthesized from aniline and PDC to confirm the formation of polyamides from diamines.