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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Synergistic Interface Engineering and Band Alignment Enable High-Temperature Capacitive Performance in PAEK-Based
Jian Wang1, Miaomiao Zuo1, Chenyang Tang2
1Ningxia Key Laboratory of Photovoltaic Materials, School of Materials and New Energy, Ningxia University, Yinchuan 750021, China.
ACS Applied Materials & Interfaces
|May 16, 2025
Summary
New polymer dielectric nanocomposites using functionalized Boron Nitride Nanosheets (BNNS) in poly(aryl ether ketone) (PAEK) significantly reduce energy loss. These materials achieve high energy storage density and breakdown strength, even at elevated temperatures.
Area of Science:
- Materials Science
- Electrical Engineering
- Polymer Science
Background:
- Polymer dielectric capacitors are vital for high-power electrical systems, but suffer from conduction loss at high temperatures and electric fields.
- Developing materials that maintain performance under extreme conditions is crucial for advanced energy storage.
Purpose of the Study:
- To engineer polymer dielectric nanocomposites with enhanced energy storage capabilities at high temperatures and electric fields.
- To overcome the challenge of conduction loss in polymer dielectrics.
Main Methods:
- Fabrication of dual-functionalized Boron Nitride Nanosheets (BNNS) with -NH2 and -F groups (F-BNNS-NH2).
- Incorporation of F-BNNS-NH2 into carboxylate-functionalized poly(aryl ether ketone) (PAEK-COOH) to create robust interfacial bonding.
- Regulation of BNNS band structure using electron-withdrawing -F groups to widen the energy gap (Eg).
Main Results:
- Achieved robust interfacial bonding, excellent thermal stability, and mechanical properties in the BNNS/PAEK composites.
- Demonstrated significantly restrained conduction loss and enhanced energy storage density.
- Attained a record breakdown strength of 600 MV/m, energy density of 5.58 J/cm3, and 5.01 J/cm3 at 90% efficiency at 150 °C.
Conclusions:
- The developed F-BNNS-NH2/PAEK-COOH nanocomposites offer superior dielectric performance for extreme-condition energy storage.
- Harmonizing interfacial reinforcement with electronic structure regulation presents a new strategy for advanced dielectric materials.
