The dielectric time domain differential spectroscopy of polyethylene terephthalate

Studies of dielectric time domain differential spectroscopy in thermodynamically equilibrium state for polyethylene terephthalate (PET) film samples are reported. The experimental results show that the response function is F_n=exp[-(t/τ_n)α(n)] with and two typical value of α_n are α_n=1 and α_n=1/2 in low temperature condition; the line of time domain spectroscopy split up in high temperature condition and the τ_n(n>1) of slow response can increase as the temperature rising. A model that free diffusion of the unequilibrium binding space charge can describe the discharge relaxation process of PET film is suggested