Dielectric spectroscopy and thermally stimulated discharge current in PEEK film
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over a wide range of frequency. There is no relaxation peak in the range of 1Hz to 10 5 Hz but in the low-
frequency side (10 -4 Hz) there is an evidence of a peak that also can be observed by thermally stimulated
discharge current measurements. That peak is related with the glass transition temperature (T g ) of the
polymer. The activation energy of the relaxation was found to be 0.44 eV, similar to that of several
synthetic polymers. Space charges are important in the conduction mechanism as shown by discharging
transient.
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