Relaxation properties of glass and graphite loaded PTFE composites

The relaxation properties of polytetrafluoroethylene (PTFE) blends loaded with graphite flakes and glass fibers have been studied using dielectric spectroscopy. The Fourier transforms of decay functions: open-circuit voltage and short-circuit current after charging in corona triode were applied to analysis of complex susceptibility data χr(ω) in the frequency domain. This technique can be applied for characterization of very heterogeneous dielectrics that have the ability for charge trapping. The measurement of the susceptibility function can be extended to very low frequencies (∼10−5 Hz).