The role of polar relaxers in the formation of the piezoelectric state in the vinylidene fluoride-tetrafluoroethylene copolymer

Abstract

In this work, the corona electret and piezoelectric states of vinylidene fluoride-tetrafluoroethylene (P(VDF-TFE)) copolymer films were studied to determine the correlation between these states. Previously, it was determined that in the objects under study there are two types of polar structures that differ in the values of activation energy and frequency factor. A detailed description of the application of a numerical method for processing experimental curves of thermally stimulated short-circuit currents, the Tikhonov method of weak regularization, which makes it possible to determine the parameters of polar structures of both types, is given. It is shown that the key role in the formation of the piezoelectric state in P(VDF-TFE) is played by polar structures with a lower activation energy.

Keywords

• electret state
• polyvinylidene fluoride
• thermally activation spectroscopy
• Tikhonov's weak regularization method
• piezoelectric effect