Mechanical relaxation in arimide PM fibres in the temperature range 20?900�K

The temperature dependences of the tangent of the mechanical loss angle, tan δ, the dynamic shear modulus, G', and the velocity of shear waves, ct, of arimide PM fibre have been studied by the method of free twisting oscillations in the temperature range 20–900°K, at frequencies of 0.2–1 Hz.