Low-cost, simple preparation and outstanding energy density of glass fiber reinforced PVDF polymer flexible composites.

• The glass fiber filler is adopted as the filler. • The composition of the PVDF-glass fiber composites and the film formation are simple. • Within a specific content range, the BDS synchronously increase with the ε of the material. To make the product commercially viable and applicable, the inclusion of glass fiber filler with a low cost and medium dielectric constant (ε) is adopted as the filler. Synchronously, representative polyvinylidene fluoride (PVDF) with high permittivity and breakdown strength is selected as optimal polymer matrix. And surface modifying agent is employed as organic coatings to weaken the surface energy of glass fiber and boost the interfacial inter-action. An investigation of dielectric properties was conducted by preparing flexible composites consisting of various content of glass fiber. The ε of composites can be significantly enhanced in the PVDF composites with glass fiber, and the breakdown strength (BDS) is remained at a high level. Moreover, within a specific content range, glass fiber makes the ε and BDS of the material increase synchronously. This work provides a facile strategy for the development of excellent performance, simple preparation and low-cost flexible composites. [ABSTRACT FROM AUTHOR]