摘要
:
Organic film capacitors for modern electronic devices and electrical systems are greatly reliant on polymer-based composites with superior breakdown strength, preeminent dielectric properties, and remarkable permittivitytemperatur...
展开
Organic film capacitors for modern electronic devices and electrical systems are greatly reliant on polymer-based composites with superior breakdown strength, preeminent dielectric properties, and remarkable permittivitytemperature stability. Herein, the barium titanate@polydopamine@carboxyl-functionalized poly(arylene ether nitrile) (BTOH@PDA@CPEN) with core@double-shell structure was successfully achieved through in-situ polymerization assisted with strong electrostatic interaction. The results of structural characterization demonstrated that the PDA and CPEN shells were completely wrapped on the surface of BTOH core to form core@double-shell structure. Furthermore, the dielectric composite films were prepared by using BTOH@PDA@CPEN as the filler and poly(arylene ether nitrile) (PEN) as the matrix. The synergistic effects of improved interfacial compatibility, multi-interfacial polarization induced by PDA, and insulating barrier of CPEN enhance dielectric constant and synchronously suppress dielectric loss of PEN-based composite films. The as-gained composite film with 20 wt% BTOH@PDA@CPEN loading reveals an preeminent dielectric properties with a constant of 12.258 @ 1 kHz and a loss of 0.023 @ 1 kHz, while the PEN matrix is just 3.750 @ 1 kHz and 0.015 @ 1 kHz, respectively. The dielectric constant-temperature coefficients of composite films are lower than 2 x 10-3 oC- 1 at 30-170 degrees C, indicating excellent permittivity-temperature stability. The maximal values of breakdown strength and energy density of the composite films achieve to 253.8 kV mm-1 and 1.537 J cm-3, respectively, higher than that of PEN, presenting enhanced energy storage capacity. Furthermore, the composite films also manifest surpassing flexibility and outstanding thermal stability. This work demonstrates the potential value of using core@double-shell structure fillers for the construction of polymer dielectrics to accommodate extreme harsh environment.
收起