# Ultra-low concentration PVA-doped PMMA: an all-organic dielectric with markedly improved dielectric properties and energy storage performance

## TL;DR

This paper introduces an all-organic dielectric material made by adding a tiny amount of PVA to PMMA, significantly improving its energy storage performance.

## Contribution

The study demonstrates that ultra-low PVA doping in PMMA markedly enhances dielectric properties and energy storage density.

## Key findings

- A PVA-doped PMMA film achieved 7.83 J cm−3 energy storage density at 580 MV m−1 electric field.
- The energy storage efficiency of the composite film was 86.34%.
- Only 0.025 wt% PVA was needed to achieve significant improvements in dielectric properties.

## Abstract

Polymer dielectrics are widely used in the fabrication of dielectric capacitors due to their excellent insulating properties. However, the relatively low dielectric constant (εr) limits the energy storage density (Ud) of polymer dielectrics. This study fabricated P(VA)MMA composite films by incorporating ultralow-content (<0.1 wt%) PVA into PMMA matrices. By systematically varying the PVA doping concentration (0.025–0.075 wt%), the εr and Ud were effectively optimized. Notably, the P(VA_1)MMA film with 0.025 wt% PVA doping concentration achieved a high Ud of 7.83 J cm−3 at 580 MV m−1 electric field, representing a 29.64% enhancement compared to pure PMMA film while maintaining an energy storage efficiency of 86.34%. This study successfully developed all-organic dielectric materials with significantly enhanced dielectric constant and energy storage properties at ultra-low doping concentrations, which holds important implications for the advancement of dielectric capacitors.

By incorporating a small amount of PVA into PMMA, the dielectric constant of the composite dielectric was significantly increased with only a slight rise in dielectric loss, ultimately yielding a desirable energy storage density.