Abstract
Room temperature electrode poling is by far the simplest and the most convenient way of preparing piezoelectric films of poly(vinylidene fluoride) PVF2. A shortcoming of this poling technique is, however, the relatively low electric field (<3.5 MV/cm) that can applied to the film without incurring instantaneous flashover or arcing around the film edge. We demonstrate here that by simply adding a rubber O ring and a plastic plate to the regular electrode poling setup, it is possible to pole biaxially oriented PVF2 films with fields up to about 9 MV/cm for at least 5 s without incidence of breakdowns. The piezoelectric e31 coefficient of the poled film rises sharply with increasing field but, after reaching a value of about 21 mC/m2 (d31=7.5 pC/N) at 2.5 MV/cm, it levels off gradually to a value of about 31 mC/m2 (d31=11 pC/N) at fields above 6 MV/cm.
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