Composite of P(VDF‐CTFE) and aromatic polythiourea for capacitors with high‐capacity, high‐efficiency, and fast response

For next generation of miniaturized personal electronics and pulsed power systems for smart power grids, electric vehicles, and electromagnetic launchers, flexible capacitors from dielectric polymers with high-capacity, high-efficiency, and fast response are highly desirable. Dielectric polymer composite of P(VDF-CTFE), that is poly(vinylidene fluoride-chlorotrifluoroethylene) and a small amount of aromatic polythiourea (PTU) has been described. It combines the merits of both polymers, that is high dipole density and easy processability of P(VDF-CTFE), as well as large dipole moment and high charge–discharge efficiency of PTU. Most impressively, PTU boosts the maximum breakdown strength of P(VDF-CTFE), and thus extracts its maximum energy reserve capacity. PTU also contributes to the promoted charge–discharge efficiency, accelerated discharge, and reduced dielectric loss in P(VDF-CTFE), which facilitate the composite for flexible capacitor applications. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 193–199