Polyaniline/poly(vinylidene fluoride) functional hybrid films with high electric energy density

To obtain the dielectric capacitor composites, poly(vinylidene fluoride) and conductive polyaniline were selected as the polymer matrix and the filler respectively. The influence of filler contents on the dielectric properties was studied. The results showed that when the polyaniline content was up to 0.05, the dielectric permittivity of the hybrid film was as high as 457 (at 100 Hz), the breakdown strength was 60 MV/m, and the energy density was 7.2 J/cm³, which was three times larger than that of neat matrix. The result of SEM revealed that polyaniline can disperse uniformly in the matrix, The percolative theory and microcapacitor model were employed to explain the results. This route was demonstrated to be effective to prepare high energy density capacitor materials.