Abstract
By means of the ac calorimetry technique, the ferroelectric transition behavior of vinylidene fluoride/trifiuoroethylene (VDF/TrFE) copolymers was investigated. The data from ac calorimetry were compared with those from adiabatic calorimetry to elucidate the orders of the transition. From the comparison, it was clarified that the ferroelectric transitions of copolymers containing 73 and 65 mol% VDF are of the first order, while the copolymer with 55 mol% VDF shows the second-order character. These results were qualitatively explained using a simple model for rotational transitions. Throughout this work, an important feature of ac calorimetry, i.e., the exclusion of the contribution of latent heat, was confirmed in the measurements of PE and VDF/TrFE copolymers.
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