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<p>Dielectric capacitors, as core components for energy storage and conversion, are limited in emerging applications by their low energy storage density. In this work, methyl methacrylate-butadiene-styrene (MBS) was blended with poly (vinylidene fluoride) (PVDF) via a facile solution casting method to fabricate all-organic PVDF/MBS dielectric films. Results demonstrate that the optimized film with 13 wt% MBS exhibits a breakdown strength of 481 MV/m and an energy storage density of 6.57&#xa0;J/cm<sup>3</sup>, which is 1.67 times higher than that of pristine PVDF (3.94&#xa0;J/cm<sup>3</sup>). The entanglement network between MBS and PVDF molecular chains reduces intermolecular chain gaps in the PVDF matrix while mitigating defects in amorphous regions. This suppression of structural imperfections effectively inhibits electrical treeing propagation at interfaces under external electric fields, contributing to enhanced breakdown strength. The incorporation of MBS induces localized stress concentration at rubbery cores, triggering the formation of crazes and shear bands. These microstructures effectively disperse and absorb impact energy, contributing to the enhanced breakdown strength. SEM analysis reveals ductile fracture characteristics on the film surface, consistent with Young’s modulus decreases from 954&#xa0;MPa (pristine PVDF) to 499&#xa0;MPa for the 13 wt% PVDF/MBS composite. This study proposes a strategy to develop high-performance all-organic dielectric films.</p>

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Craze-toughening strategy for PVDF-based all-organic dielectric films with high breakdown strength

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Xiyi Liu,
  • Hongwei Lu,
  • Shijia Yang,
  • Weitao Su

摘要

Dielectric capacitors, as core components for energy storage and conversion, are limited in emerging applications by their low energy storage density. In this work, methyl methacrylate-butadiene-styrene (MBS) was blended with poly (vinylidene fluoride) (PVDF) via a facile solution casting method to fabricate all-organic PVDF/MBS dielectric films. Results demonstrate that the optimized film with 13 wt% MBS exhibits a breakdown strength of 481 MV/m and an energy storage density of 6.57 J/cm3, which is 1.67 times higher than that of pristine PVDF (3.94 J/cm3). The entanglement network between MBS and PVDF molecular chains reduces intermolecular chain gaps in the PVDF matrix while mitigating defects in amorphous regions. This suppression of structural imperfections effectively inhibits electrical treeing propagation at interfaces under external electric fields, contributing to enhanced breakdown strength. The incorporation of MBS induces localized stress concentration at rubbery cores, triggering the formation of crazes and shear bands. These microstructures effectively disperse and absorb impact energy, contributing to the enhanced breakdown strength. SEM analysis reveals ductile fracture characteristics on the film surface, consistent with Young’s modulus decreases from 954 MPa (pristine PVDF) to 499 MPa for the 13 wt% PVDF/MBS composite. This study proposes a strategy to develop high-performance all-organic dielectric films.