High‐Temperature Polymer Dielectrics for Aerospace Electrical Equipment

Min, Daomin; Song, Xiaofan; Yang, Lingyu; Zhang, Yuanshuo; Wang, Shihang; Li, Shengtao

doi:10.1002/9783527841059.ch8

High Temperature Polymer Dielectrics 2023

DOI: 10.1002/9783527841059.ch8

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High‐Temperature Polymer Dielectrics for Aerospace Electrical Equipment

Daomin Min,

Xiaofan Song,

Lingyu Yang

et al.

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2024

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Cited by 3 publications

References 36 publications

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Electrical Conductivity Characteristic of Polyimide under Long-Term Combined Electron Irradiation and Thermal Cycle in Vacuum

Chen,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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During long-term operation, low-earth-orbit spacecraft are exposed to a severe environment of electron irradiation and thermal cycle. This affects the electric properties of polyimide, an essential insulation material for spacecraft electrical transmission equipment, particularly the conductivity characteristic. Therefore, this paper investigates the conductivity and its evolution of polyimide after the combination of 20 keV, 8 nA/cm2 electron irradiation, and 243–343 K, 5 K/min thermal cycle in a vacuum environment for 432 h. The results show that the conductivity increases by about 2 orders of magnitude over 432 h, with the threshold field for electric-field-dependent conductivity decreasing. The conductivity growth rate varies, rising during the first 192 h, then increasing in the midelectric field, and decreasing in the high electric field regions. The thermally stimulated depolarization current method demonstrates that increases in γ, β1, and β2 trap densities, associated with enhanced motility of end groups, diamines, and dianhydrides after long-chain breaks, lead to higher conductivity and growth rate. Additionally, increases in β3 and α trap densities, related to increased CO bonds and free radicals, reduce the threshold field and the conductivity growth rate in the range of 57.0–100.0 kV/mm after 192 h. These findings provide a reference for the performance evaluation and enhancement of spacecraft polyimide materials.

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Electrical Conductivity Characteristic of Polyimide under Long-Term Combined Electron Irradiation and Thermal Cycle in Vacuum

Chen,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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The Effect of Long-Term Electron Irradiation on Trap Distribution Characteristics of Polyimide

Chen,

Zhang

et al. 2024

IEEE Trans. Plasma Sci.

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Polyimide-Based Dielectric Materials for High-Temperature Capacitive Energy Storage

Liu,

Li,

Zhang

et al. 2024

Electronic Materials

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Polyimide (PI) has received great attention for high-temperature capacitive energy storage materials due to its remarkable thermal stability, relatively high breakdown strength, strong mechanical properties, and ease of synthesis and modification. In this review, several key parameters for evaluating capacitive energy storage performance are introduced. Subsequently, the properties of the commercially available PIs are presented. Then, the recent development of designing and tailoring all-organic PI-based polymers is discussed in detail, focusing on molecular composition and spatial configuration to enhance dielectric constant, breakdown strength, discharged energy density, and charge-discharge efficiency. Finally, we outline the current challenges and future development directions of PI-based high-temperature energy storage dielectric materials.

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High‐Temperature Polymer Dielectrics for Aerospace Electrical Equipment

Cited by 3 publications

References 36 publications

Electrical Conductivity Characteristic of Polyimide under Long-Term Combined Electron Irradiation and Thermal Cycle in Vacuum

Electrical Conductivity Characteristic of Polyimide under Long-Term Combined Electron Irradiation and Thermal Cycle in Vacuum

The Effect of Long-Term Electron Irradiation on Trap Distribution Characteristics of Polyimide

Polyimide-Based Dielectric Materials for High-Temperature Capacitive Energy Storage

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