Description of the mechanical relaxation of highly oriented polymers based on their relaxation spectra

Both the shape and width of the relaxation spectra of polymers with different draw ratios are analyzed in regions of relaxation transitions. The analysis substantiates an empirically ascertained linear law governing the frequency distribution of the dynamic modulus E'(omega) of highly oriented polymers in E' - In omega coordinates, which corresponds to the uniform distribution of a single relaxation time H(tau) congruent to const. The possibility of describing the temperature dependence of the modulus of highly oriented polymers within a broad temperature range is demonstrated, where a single relaxation time is used and consideration given to the nonuniform distribution of the energy of fundamental vibrations with respect to oscillatory modes.