Piezoelectric Properties in Uniaxially Drawn Copolymers of Vinylidene Fluoride and Trifluoroethylene

概要

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The piezoelectric constants d_<3i> and e_<3i> (i=1-3) have been determined as a function of the remanent polarization P_x in uniaxially drawn and poled copolymers or vinylidene fluoride and trifluoroethylene or composition 52/48, 65/35, and 73/23 mol %. The e constant is linearly proportional to P_x, while the d constant is nonlinear because of an increase in the elastic constant at high P_x. The observed values of e_<31>, e_<32> and e_<33> are compared with prediction of the dimensional effect : e_<31>=e_<32>=0, e_<33>=-P_x. It is found that the dimensional effect is dominant in the observed activity or 73/27 copolymer, while to the 52/48 copolymer there is another dominating mechanism. The electrostrictive coupling characteristic of ferroelectric materials is examined and its additional contribution is shown to explain the observed piezoelectric activities in the copolymers havins relatively low Curie temperature.
社団法人応用物理学会の論文
1984-11-20