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Enhanced Dielectric Properties from Space Charge-Induced Interfacial Polarization in Multilayer Polymer Films

Abstract

With recent advancement of power electronics, polymer film capacitors becomes increasingly important. However, the low temperature rating (up to 85 °C) and low energy density (5 J/cm3 at breakdown) of the state-of-the-art biaxially oriented polypropylene (BOPP) films have been limiting factors for advanced power electronics. Based on our recent work, multilayer films (MLFs), which consist of a high energy density polymer [e.g., poly(vinylidene fluoride) (PVDF)] and a high breakdown/low loss polymer [e.g., polycarbonate (PC)], have shown potential to achieve high energy density (13-17 J/cm3), enhanced breakdown strength, high temperature tolerance, and low loss simultaneously. In this study, dielectric properties of PC/PVDF 50/50 32- and 256-layer (32L and 256L) films were investigated. The breakdown strengths for the 32L films were as high as 800 MV/m at room temperature, as compared to 600 MV/m for PVDF and 750 MV/m for PC. The temperature rating for the 32L film reached 120 °C, higher than that of BOPP. In addition, it was observed that the 32L film with thicker PC layers exhibited a higher breakdown strength and a lower DC conductivity than the 256L film with thinner PC layers at elevated temperatures. These differences were attributed to the difference in the interfacial polarization of space charges, which was further verified by thermally stimulated depolarization current spectroscopy. From this study, we conclude that interfacial polarization endows MLFs with the desirable dielectric properties for next generation film capacitors.

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Publication details

The article was received on 12 Aug 2017, accepted on 14 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03653A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Enhanced Dielectric Properties from Space Charge-Induced Interfacial Polarization in Multilayer Polymer Films

    X. Chen, J. Tseng, I. Treufeld, M. Mackey, D. Schuele, R. Li, M. Fukuto, E. Baer and L. Zhu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03653A

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