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The relationship between the applied elastic strain gradient and the inducedelectric polarization in the alpha-phase polyvinylidene fluoride (PVDF) filmsunder bending conditions has been investigated. Our experimental studies haveshown that the flexoelectric polarization is linearly proportional to thestrain gradient and the corresponding direct flexoelectric response is strong.It is reasonable to believe that the physical mechanisms behind theflexoelectric effects in polymers and solid dielectrics are different.

Strain gradient induced electric polarization in alpha-phase polyvinylidene fluoride films under bending conditions