Dielectric Properties of Polyamides: Polyhexamethylene Adipamide and Polyhexamethylene Sebacamide

The dielectric relaxation in two polyamides has been studied over a temperature range from -100 to 175 °C and a frequency range from 50 c/s to 10 Mc/s. The effects of various thermal treatments on the relaxation behavior and density, X-ray diffraction, and intrinsic viscosity have been studied. The polyamides were poly(hexamethylene adipamide) and poly(hexamethylene sebacamide). Four relaxation phenomena have been identified. Mechanical relaxation processes are compared with the dielectric phenomena and possible molecular mechanisms are discussed.