4.7 Article

Covalently modified and hierarchically structured corn-like BNNs@BT/benzoxazole composites with enhanced dielectric properties over an ultra-wide temperature range

Journal

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2022.107027

Keywords

Hybrid; Polymer-matrix composites (PMCs); Electrical properties; High-temperature properties

Funding

  1. National Natural Science Foundation of China [52073091, 22171086]
  2. Natural Science Foundation of Shanghai [20ZR1414600]
  3. Fundamental Research Funds for the Central Universities [JKD01221632]

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Polymer dielectric materials are widely used in pulsed power technology and high-energy weapon systems. This study presents a method to prepare functional corn-like hybrids consisting of BaTiO3 nanowires (BT) and BNNs nanosheets, which show high discharged energy density, charge and discharge efficiency, and wide temperature dielectric stability. The hybrids provide a promising dielectric nanocomposite candidate for high temperature applications.
Polymer dielectric material is widely used in pulsed power technology and high-energy weapon systems. However, enhanced dielectric constant of polymer is accompanied by suppressed breakdown strength with the addition of dielectric ceramic. Herein, we report an efficient method to prepare functional corn-like hybrids which consist of BaTiO3 nanowires (BT) and BNNs nanosheets based on surface modification and high temperature ceramization. It is demonstrated that the outer BNNs not only optimizes the intrinsic dielectric difference matching, but also effectively suppress the loss caused by carrier migration. Especially, an increasement for operating temperature is achieved with the help of the poly-p-phenylene benzobisoxazole (PBO). Under 4 wt % filling, the composites have the highest discharged energy density (U-d = 2.24 J cm(-3)). Meanwhile, it also has high charge and discharge efficiency (eta = 85 %) and an ultra-wide temperature dielectric stability (25 ?-200 ?). This work provides a promising dielectric nanocomposite candidate for high temperatures applications.

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