Dielectric Enhancement Over A Broad Temperature By Nanofiller At Ultralow Volume Content in Poly(ether methyl ether urea)
This Letter studies the dielectric responses of nanocomposites of poly(ether methyl ether urea) (PEMEU) with alumina nanofillers at less than 0.7% volume loading (0.7 vol. %). The results show that the dielectric constant K of PEMEU nanocomposites is enhanced by the nanofillers. The enhancement peaks at 0.33 vol. % nanofiller loading, from K = 3.9 of neat polymer to K = 5.5 of nanocomposites from room temperature to 200 °C, above the glass transition (∼150 °C) of the polymer. Except for an enhanced dielectric constant, the nanocomposite maintains a low dielectric loss and a high breakdown strength of 500 MV/m at room temperature and 300 MV/m at 150 °C, respectively. Thus, the nanocomposite with 0.33 vol. % nanofillers delivers discharged energy densities of 6.5 J/cm^3 at room temperature and 2 J/cm^3 at 150 °C with better than 90% charge/discharge efficiency, 40% higher than the neat polymer. This material is based upon the work that reflected the research supported by the Office of Naval Research under Award No. N00014-19-1-2028.
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in [Dielectric enhancement over a broad temperature by nanofiller at ultra-low volume content in poly(ether methyl ether urea). Applied Physics Letters 117, 7 p072905 (2020)] and may be found at https://doi.org/10.1063/5.0020280.
|Work Title||Dielectric Enhancement Over A Broad Temperature By Nanofiller At Ultralow Volume Content in Poly(ether methyl ether urea)|
|License||In Copyright (Rights Reserved)|
|Publication Date||August 17, 2020|
|Publisher Identifier (DOI)||
|Deposited||May 09, 2022|
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