Structure change and energy storage property of poly(vinylidene fluoride-hexafluoropropylene)/poly (methyl methacrylate) blends

Abstract

In this work, in order to reduce the energy loss induced by the ferroelectric P(VDF HFP) and improve energy storage property, a series of P(VDF HFP)/PMMA blend films were prepared via biaxially oriented technology. The results showed that the ratio of alpha crystal continuously decreased with the addi tion of PMMA, the ratio of beta crystal firstly increased, followed by a reduction with further rising the PMMA percentage. Though gamma ratio was small, it enhances steadily. With the addition of PMMA, it could be found out the disorder in crystal structure, the reduction in crystal size, and the drop in crystallinity of P(VDF HFP). The structure change improved the discharge efficiency and temperature stability. With the addition of PMMA, tanδ is enhanced more than 10°C, and the discharge energy efficiency improved from 45% of pure PVDF to 75% under 400 MV/m after modifying with PMMA. This improvement in the dis charge energy efficiency is thought due to the formation of new crystal γ 2b.

Highly Transparent PVDF Films with Enhanced Dielectric and Energy Storage Properties Tailored by a PMMA-co-GMA Copolymer

“…Figure a,b illustrates the comparison of this paper with data from other literature. − By comparing with other literature, it is easy to find that the PVDF/MG composite prepared in this paper has a significant improvement in discharge energy density and maintains a high charge/discharge efficiency under a high electric field. This work uses a PMMA-like linear MG copolymer to enhance the energy storage performance of PVDF.…”