Fecha de publicación: -- Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Electrospinning-parameter screening identified high-aspect-ratio V10C20D20FR0.8 BZT nanofibers, whose incorporation in PVDF promoted β-phase formation and improved dielectric response. Within the tested V10C20D20FR0.8 content series, 1.25 vol% provided the best energy-storage performance, demonstrating how measured fiber morphology and filler loading jointly influence composite behavior.

ABSTRACT
One-dimensional relaxor ferroelectric nanofiller can enhance the dielectric properties of polyvinylidene fluoride (PVDF)-based composite films. However, the impact of fiber morphology on these properties is unclear, with existing studies lacking systematic investigation. In this work, BaZr0.2Ti0.8O3 nanofibers (BZT_nfs) were prepared by electrospinning. A sequential experimental design was used. First, electrospinning parameters were screened at a fixed filler loading of 2.5 vol% to isolate the influence of nanofiber morphology. V10C20D20FR0.8, with a mean diameter of 81.6 nm, mean length of 7.6 μm, and aspect ratio of 93:1, can significantly promote β-phase formation in PVDF (with a β-phase content up to 91.2%) and improve the permittivity of the composites. Therefore, it was selected for the subsequent filler-loading investigation. Toward PVDF matrix doped with BZT_nfs at a volume ratio of 1.25 vol%, the composite film shows a dielectric constant of 12.9 at 103 Hz, a breakdown strength of 450 kV/mm, a maximum discharge energy density of 12.2 J/cm3, and a charge–discharge efficiency of 61.3%. Optimizing electrospinning parameters enables precise regulation of BZT_nfs morphology and establishes the structure–property relationship of “fiber morphology—crystal phase transition - dielectric properties”, providing a feasible strategy for preparing one-dimensional relaxor ferroelectric nanofiller in high-energy storage dielectric composites.