Poly(vinylideneflouride‐hexafluoropropylene) (PVDF‐HFP) copolymer films were simultaneously stretched and static electric poled (SSSEP) in seriate mode. The experimental results exhibited that SSSEP greatly enhanced the piezoelectric properties of the PVDF‐HFP films and slightly increased the dielectric properties of the films. The maximum piezoelectric coefficient d33 24 pC/N higher than the reported was obtained in these films under optimum condition. Based on the wide angle X‐ray diffraction results, the SSSEP films showed more organized crystalline structure than the only stretched films. POLYM. ENG. SCI., 47:1630–1633, 2007.
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Huan et al. (2007) studied this question.
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