Synthesis and properties of poly(dimethylxylylenylamides)

Poly(dimethylxylylenylamides) were synthesized from six different diphenylenediamenes and two dimethyl‐substituted xylylenyldiacid chlorides by solution polycondensation at low temperature. The model compound 2,5‐demethyl1,4‐benzediacetanilide was synthesized and characterized by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The polyamides were characterized by IR and viscosity measurements. Some of the polyamides showed crystalline behavior in the x‐ray diffractograms. The polyamdes have decomposition temperatures in the range 370–310°C in air and are soluble in all amide solvents. The effects of subsituents on crystallinity, thermal stability, and solubility of the polymides are also discussed.