Strengthened epoxy nanocomposites with binary fillers of magnetite@polyaniline and carbon nanofiber for high-performance thermal stability electromagnetic wave absorption

doi:10.1016/j.jmst.2025.05.003

Abstract

Abstract: To address the electromagnetic wave pollution issue induced by widespread applications of electronic devices and 5 G technology, multifunctional epoxy composites reinforced with both 0-D magnetite (Fe₃O₄)@polyaniline with a core-shell structure and 1-D carbon nanofibers were prepared by the in situ polymerization method. The nanocomposites exhibit good mechanical properties, thermal stability, and electromagnetic wave absorption performance. The reflection loss can be -55.73 dB at 7.17 GHz, and the effective absorption bandwidth can reach 1.96 GHz at 3.2 mm. The excellent electromagnetic wave absorption performance is related to the magnetic loss (eddy current loss, magnetic resonance) and dielectric loss (interfacial polarization loss, dipolar polarization loss, and conduction loss). Moreover, when the mass ratio of 0-D Fe₃O₄@polyaniline to 1-D carbon nanofiber is 48:1, the tensile strength is improved to 47.8 MPa compared with epoxy composites with only Fe₃O₄@polyaniline particles. Meanwhile, the thermal stability and thermal conductivity of the multifunctional epoxy composites were systematically analyzed as well. This work provides a new idea to prepare the multifunctional epoxy composites with excellent electromagnetic wave absorption performance.

Key words: 0-D Fe₃O₄@polayniline, 1-D carbon nanofiber, Electromagnetic wave absorption

Juanna Ren, Yukun Sun, Mukun He, Mohamed H. Helal, Wenhao Dong, Xiuyun Ma, Jiang Guo, Jianfeng Zhu, Eman A. Ayob, Ben Bin Xu, Hassan Algadi, Zhanhu Guo, Hua Hou. Strengthened epoxy nanocomposites with binary fillers of magnetite@polyaniline and carbon nanofiber for high-performance thermal stability electromagnetic wave absorption[J]. J. Mater. Sci. Technol., 2026, 243: 139-148.

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