Improving dielectric properties of polypropylene film for metallized film capacitors by MOF nanoparticle

Abstract

In this paper, the polypropylene (PP) composite film with improved dielectric properties are prepared by adding the metal-organic framework (MOF) nanoparticles (ZIF-8). After doping with MOF, the maximum permittivity increase from 2.42 to 2.56, the minimum dielectric loss tangent declines from 0.49% to 0.05%. At a filling content of 0.06wt%, the composite films show an enhanced DC breakdown strength of 589.6 kV /mm, which are 16.4% higher than that of pure PP film. And the conductivity also decreased. The theoretical maximum energy storage density of the composite film can reach 3.67 J/cm3, which is 33.9% higher than that of pure PP film. ZIF-8 nanoparticles can provide more traps to capture carriers and limit carrier migration, preventing the breaks of PP molecular chains. This paper provides a perspective to fabricate polymer-based films with outstanding dielectric properties utilizing MOF nanoparticle.