Temperature Dependence of Shear Piezoelectric Properties of Poly (vinylidene fluoride) Studied by Piezoelectric Resonance Method

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Elastic and dielectric anisotropies, and shear piezoelectric properties of uniaxially oriented poly(vinylidene fluoride) (PVDF) were determined in the temperature range from 10 K to 400 K by a piezoelectric resonance method. The shear piezoelectric stress constant e_<24> increases above the primary dispersion temperature, while e_<15> decreases markedly and tends to zero at 390 K: e_<24> and e_<15> are, respectively, 28 mC/m^2 and 38 mC/m^2 at 10 K, and 48 mC/m^2 and 15 mC/m^2 at 295 K (where the coordinate axes X and Z in the film refer to the stretching axis and poling axis, respectively). The temperature dependences of e_<24> and e_<15> are analyzed on the basis of the model in which the crystalline and amorphous phases are combined in series and parallel along the chain axis. The analysis shows that e_<15> in the crystalline phase decreases considerably above the primary dispersion temperature, whereas e_<24> in the crystalline phase increases with increasing temperature.
社団法人応用物理学会の論文
1996-03-15