High cyclic stability of electrocaloric effect in relaxor poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymers in the absence of ferroelectric phase transition

• DOI: 10.1063/1.5127310
• Publication Date: 2019-12-17T13:00:08Z
• Authors: Yang Liu; Guangzu Zhang; Aziguli Haibibu; Zhubing Han; Qing Wang
• Keywords: Electrocaloric Effect; Ferroelectric Polymers; Transition temperature

The incorporation of bulky defects into ferroelectric poly(vinylidene fluoride-trifluoroethylene) copolymers can result in a relaxor behavior, accompanied by outstanding electrocaloric properties near room temperature. However, it remains elusive whether transition occurs terpolymers, which is critical for the design cooling devices. In this work, we study fatigue fluoride-trifluoroethylene-chlorofluoroethylene) (61.8/30.4/7.8 mol. %) terpolymer, revisit its controversial issue phase transition. We observe that response terpolymers nearly constant (ΔS = 25.5 J K−1 kg−1, ΔT 5.1 K at 100 MV m−1) within 50 cycles different temperatures around Moreover, conduct temperature-dependent X-ray diffraction and Fourier-transform infrared spectroscopy measurements on terpolymer to provide insights evolution intermolecular lattice spacing intramolecular conformation. find no clear evidence ferroelectric-to-paraelectric temperature range, where differential scanning calorimeter measurement displays an endothermic peak.