Dielectric relaxation properties of poly(ethylene-terephthalate)-polyaniline composite films

The dielectric relaxation measurements on poly(ethylene-terephthalate) (PET) containing adsorbed aniline and polyaniline (PAni), prepared by polymerization into the PET matrix, have been performed between 173 and 403 K in the frequency range 1 to 107 Hz. The influence of aniline and PAni on the β-relaxation of PET and the effect of the presence of PAni on the α-relaxation of PET have been studied. For the films PET–PAni doped with HCl, two relaxation processes around 0.5–5 kHz and 0.2–1 MHz were observed.