Abstract
Three types of VDF/TrFE copolymer samples were prepared. Thermally stimulated depolarization currents (TSDC) of copolymers have been measured with a modified thermal electric analyzer. For the quenched VDF(70)/TrFE(30) sample, if the poling temperature T p is below 80 °C, the TSDC spectra only show one peak and the peak shifts monotonously to higher temperatures as T p increases. Compared with the quenched sample, stronger TSDC signal for the annealed one suggests that the orientation of dipoles and the formation of traps are related to the perfect crystallites. γ-irradiation lowers the Curie point and induces cross-linking of chains in the copolymer. With the increase in irradiation dose the TSDC signal decreases. The irradiated materials lose their ferroelectric properties at doses above 400 kGy.
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