Abstract
The dielectric and electroactive strain properties of the poly(vinylidene fluoride–trifluoroethylene–chlorotrifluoroethylene) terpolymers with two different concentrations of chlorotrifluoroethylene (CTFE) have been studied down to cryogenic temperatures. The increase in the CTFE concentration shifts slightly the temperature where the dielectric constant maximum occurs to a lower temperature. High electroactive strain (∼1%) is obtained at room temperature for both compositions; however, the strain level decreases quickly with decreasing temperature. The dielectric relaxation process occurs for both compositions in the temperature range of 220 to 350 K, below which the dielectric constant decreases quickly to an “intrinsic” value (∼2.5). The similar variation tendency of the strain and the dielectric constant as a function of temperature indicates a close correlation between the dielectric behavior and strain activity.
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