Abstract
Effect of the hydrostatic pressure p on the ferroelectric transition Tt in copolymers of vinylidene fluoride VDF and trifluoroethylene TrFE with 47.2 and 35.4 mol-% TrFE has been investigated for dielectric behavior and thermal expansion. The permittivity peak and the abrupt increase in thermal expansion at the transition shifted markedly to higher temperature with increasing pressure. The pressure dependence of the transition dTt/dp observed was 0.31 KMPa-1 on heating for 47.2 mol-% TrFE copolymer and 0.38 KMPa-1 on heating and 0.40 KMPa-1 on cooling for 35.4 mol-% TrFE Copolymer. These values of dTt/dp were consistent with those calculated by the Clausius-Clapeyron relation. The bulk modulus evaluated from the expansion vs pressure curve exhibited a conspicuous minimum at the ferroelectric transition as found for other physical properties.
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