Preparation and Mechanism of Thermally Conductive Polyimide Phase Change Composites with Electromagnetic Wave-absorbing Performance

Yong-qiang Guo; Pan Li; Ruo-lin Zhao; Jun-wei Gu

doi:10.11777/j.issn1000-3304.2025.25144

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Preparation and Mechanism of Thermally Conductive Polyimide Phase Change Composites with Electromagnetic Wave-absorbing Performance

更新时间：2025-07-31

- Preparation and Mechanism of Thermally Conductive Polyimide Phase Change Composites with Electromagnetic Wave-absorbing Performance
- Acta Polymerica Sinica Pages: 1-14(2025)
- 作者机构：
  
  1.西北工业大学，化学与化工学院，西安 710129
  2.西北工业大学，伦敦玛丽女王大学工程学院，西安 710129
- 作者简介：
  
  Jun-wei Gu, E-mail: gjw@nwpu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25144
  CLC：
- CSTR：32057.14.GFZXB.2025.7443
- Received：12 June 2025，
  
  Accepted：23 June 2025，
  
  Published Online：31 July 2025，
- 稿件说明：
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郭永强, 李攀, 赵若琳, 顾军渭. 吸波型聚酰亚胺导热相变复合材料的制备及性能研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25144

Guo, Y. Q.; Li, P.; Zhao, R. L.; Gu, J. W. Preparation and mechanism of thermally conductive polyimide phase change composites with electromagnetic wave-absorbing performance. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25144
郭永强, 李攀, 赵若琳, 顾军渭. 吸波型聚酰亚胺导热相变复合材料的制备及性能研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25144 DOI： CSTR： 32057.14.GFZXB.2025.7443.

Guo, Y. Q.; Li, P.; Zhao, R. L.; Gu, J. W. Preparation and mechanism of thermally conductive polyimide phase change composites with electromagnetic wave-absorbing performance. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25144 DOI： CSTR： 32057.14.GFZXB.2025.7443.

摘要

电子元器件的高功率化和小型化发展使其面临日益严重的热积聚和电磁波污染问题，对高导热和优异吸波性能的相变复合材料提出了迫切的需求. 本研究通过共混电纺相分离法制备多孔聚酰亚胺(PI)纤维，以“静电喷雾-高温烧结”制备的异质结构BN@FeCo为导热/吸波填料，结合静电喷雾在PI纤维间构筑BN@FeCo导热通路，将其浸渍PW后制备吸波型BN@FeCo/PW/PI导热相变复合材料. 结果表明，当BN@FeCo质量分数为55%时，厚度为2.1 mm的BN@FeCo/PW/PI复合材料具有最优的吸波性能，其最低反射损耗为-33.1 dB，导热系数为3.22 W/(m·K).

Abstract

The trend toward high-power

miniaturized electronic components has intensified challenges related to heat accumulation and electromagnetic wave pollution

creating an urgent demand for phase change composites that simultaneously offer high thermal condu

ctivity and excellent wave-absorption properties. In this work

porous polyimide (PI) fibers were fabricated

via

blend electrospinning coupled with phase separation. Heterostructured BN@FeCo particles

serving as dual-functional fillers for thermal conduction and microwave absorption

were synthesized using an "electrostatic spray-high-temperature sintering" method. These particles were then uniformly deposited onto the porous PI fiber skeleton

via

electrostatic spraying

thereby establishing efficient thermally conductive pathways within the fiber network. Subsequently

the resulting BN@FeCo/PI framework was impregnated with paraffin wax (PW) to produce the BN@FeCo/PW/PI composites. Results demonstrated that the BN@FeCo/PW/PI composites with a BN@FeCo mass fraction of 55% and a thickness of 2.1 mm exhibited optimal wave absorption performance

achieving a minimum reflection loss (RL

min

) of -‍33.1 dB

alongside a thermal conductivity of 3.22 W/(m·K). This combination of effective electromagnetic wave attenuation and significant heat dissipation capability positions the composite as a promising solution for thermal management in advanced electronic systems.

关键词

Keywords

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