Abstract
All-polymer PVDF-based films consisting of fluoroelastomer were prepared through simple hot-pressing method, which were comprehensively explored by dielectric relaxation spectroscopy with the frequency of 20–30 M Hz and the temperature from 25 °C to 205 °C. Compared with single-layered PVDF film, The permittivities of both 30% FKM/PVDF blend film and sandwich-structured FKM/PVDF film were elevated, and the values of dielectric loss and DC conductivity dramatically dropped throughout whole temperature range. The characteristic peaks of Curie transition temperature (Tc) were detected for all samples, while Tc of sandwich-structured FKM/PVDF film shifted to a higher temperature. Moreover, the results of electric modulus spectra and Cole-Cole plots revealed the non-Debye relaxation mechanism of the studied samples. Furthermore, the values of both Eτ and Eσ for FKM/PVDF films were increased compared with single-layered PVDF, with a more profound effect on sandwich-structured FKM/PVDF film. Such higher value is beneficial to restrain the relaxing and conducing behaviors Thus, sandwich-structured FKM/PVDF film will be a potential material for enhancing electric displacement and reducing the energy loss.
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