Investigation of dielectric breakdown of polyvinylidene fluoride using AC and DC methods

The dielectric breakdown strength of polyvinylidene fluoride (PVDF) has been investigated using both AC and DC methods. The DC breakdown strength of PVDF was in the range of 720 to 770 MV/m, which was as good as or better than that of capacitor grade polypropylene film. The AC breakdown strength of PVDF was 220 to 233 MV/m. The AC-to-DC ratio of breakdown strengths for PVDF was significantly lower than that for other polymers. This observation is discussed in terms of the specific dielectric properties of PVDF, namely, its ferroelectricity.<
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