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Dielectric Performance of High Permitivity Nanocomposites: Impact of Polystyrene Grafting on BaTiO3 and TiO2

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Journal Article

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UES, Inc. Beavercreek United States

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Polymer nanocomposites are a promising concept to improve energy storage density of capacitors, but realizing their hypothetical gains has proved challenging. The introduction of high permittivity fillers often leads to reduction in breakdown strength due to field exclusion, which intensifies the applied electric field within the polymer matrix near nanoparticle interfaces. This has prompted research in developing new nanoparticle functionalization chemistries and processing concepts to maximize particle separation. Herein, we compare the dielectric performance of blended nanocomposites to matrix free assemblies of hairy polymer grafted nanoparticles HNPs that exhibit comparable overall morphology. The dielectric breakdown strength of polystyrene grafted BaTiO3 PSBaTiO3 systems was over 40 greater than a blended nanocomposite with similar loading 25 vv BaTiO3. Hairy nanoparticles with TiO2 cores followed similar trends in breakdown strength as a function of inorganic loading up to 40 vv. Dielectric loss for PSBaTiO3 HNPs was 25 times lower than analogous blended films for a wide frequency spectrum 1 Hz to 100 kHz.

Subject Categories:

  • Laminates and Composite Materials
  • Electricity and Magnetism

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