Electrostriction of the copolymer of vinylidene-fluoride and trifluoroethylene

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Abstract
In the presence of an electrical field, the mechanical behavior of thin films of copolymer of vinylydene‐fluoride and trifluoroethylene varies with the annealing temperature. If the film is annealed below the melting point of the copolymer, we observe, before any poling, an electrostriction effect mixed with a piezoelectric one. If the film is annealed above the melting point we observe only an electrostriction effect before the poling and a piezoelectric one after. The high value of the electrostriction coefficient obtained before poling could be used for actuators application.