The effect of different fabrication techniques on the formation of electroactive β-phase polyvinylidene fluoride (PVDF) has been investigated. Films with varying concentration of PVDF and solvent -dimethyl formamide (DMF) were synthesized by tape casting and solvent casting techniques. The piezoelectric β-phase as well as non polar α-phase were observed for both the tape cast and solvent cast films from X-ray diffraction (XRD) micrographs and Fourier transform infra-red spectroscopy (FT-IR) spectra. A maximum percentage (80 %) of β-phase was obtained from FT-IR analysis for a solvent cast PVDF film. The surface morphology of the PVDF films was analyzed by FESEM imaging. The dielectric properties as a function of temperature and frequency and the ferroelectric hysteresis loop as a function of voltage were measured. An enhancement in the value of the dielectric constant and polarization was obtained in solvent cast films.
Homogenous ceramic polymer composites of sodium dodecyl sulfate (SDS) modified BaTiO 3 (BT) and PZT particles as fillers and polyvinylidene fluoride (PVDF) as matrix have been developed using solution casting technique followed by hot pressing. XRD analysis confirmed the presence of both ceramic and polymer phase. The composites comprising of treated ceramic particles exhibited enhanced dielectric permittivity and reduced dielectric loss as compared with the untreated one. Furthermore, the energy density is significantly enhanced after the surface modification with SDS and the maximum energy density of 38.57 J/l was observed for SDS modified PZT-PVDF. The results showed that the addition of SDS modified ceramic particles and interface areas binds the polymer matrix with ceramic particles by electrostatic interactions and hence have an impact on the enhancement of the dielectric responses, remanent polarization and energy density of the composites.
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