Abstract
The free-standing poly (vinylidene fluoride-trifluoroethylene) [P(VDF-TrFe)] and P(VDF-TrFe)-Nafion blended films were fabricated using the casting method. The XRD and FTIR confirmed the electro-active β-phase of P(VDF-TrFe). The morphological changes were studied through SEM analysis of the blends. The dielectric and ac conductivity measurements were carried out as a function of temperature from 30 °C to 130 °C in the frequency range of 100 Hz - 1 MHz. The dielectric constant reveled a ferroelectric to paraelectric transition in all the samples with a decrease in the transition temperature of the blends. The temperature-dependent ac conductivity and power law analysis demonstrated the presence of a correlated barrier hoping mechanism with a change in the motional behavior in the blends. The blended films exhibited low dielectric loss and more stable dielecric properties with temperature in comparison to P(VDF-TrFe). These films demonstrated the potential to be used in high-temperature flexible capacitor applications.
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