Effect of calcination temperature of TiO2 on the crystallinity and the permittivity of PVDF‐TrFE/TiO2 composites

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Abstract
Composite membranes of poly(vinylidene‐trifluoroethylene)/titanium dioxide (PVDF‐TrFE/TiO2) were prepared by the solution cast method. The crystallization behavior and dielectric properties of the composites with TiO2 calcined at different temperatures were studied. Transmission electron microscopy and X‐ray diffraction (XRD) results showed that the TiO2 nanoparticles calcined at different temperatures were well dispersed in the polymer matrix and did not affect the structure of the PVDF‐TrFE matrix. XRD and differential scanning calorimeter measurements showed that the crystallinity of PVDF‐TrFE/TiO2 composites increased as the addition of TiO2 with different calcination temperatures. The dielectric property testing showed that the permittivity of PVDF‐TrFE/TiO2 membrane increased rapidly with the increase of TiO2 content and the calcination temperature of TiO2 at constant TiO2 content, but the dielectric loss did not change much. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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