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Microwave Absorption and Mechanical Properties of CNTs/ PU Composites with Honeycomb Structure

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Abstract

Honeycomb structural composites were fabricated by impregnating aramid paper frame with modified whisker carbon nanotubes (CNTs) and polyurethane resin (PU). CNTs were oxidized by using mixed acid and strong oxidant. Vector network analysis was used to measure the reflection loss (RL) of the honeycomb composites and the compressive test of honeycomb composites was carried out with a universal testing machine. For the double-layers honeycomb composites, the method of concentration gradient design can bring double absorption peak resonance benefit, which expand the microwave absorption bandwidth. Therefore, RL achieves the absorption bandwidth (< -10 dB) of 14 GHz covering 4–18 GHz for double-layer honeycomb composites. In addition, an effective model is proposed through the logarithmic law and equivalent circuit theory. The absorption property of the composites is attributed to the quarter-wavelength cancellation interference and multiple scattering, harmonic peaks move to a low-frequency stage with the increase of the CNTs average content. Compared to pristine double-layers honeycomb core, the compression strength and the elastic modulus are enhanced by 64% and 123%, respectively. The composites benefiting from the excellent mechanical and absorption performance have significant potential in stealth technology fields.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 62005010).

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Authors and Affiliations

  1. 304 Department, Xi’an Research Institute of High-Tech, Xi’an, Shanxi, 710025, China

    Song Bi, Yankai Zhao, Genliang Hou, Hao Li & Yongzhi Song

  2. College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing, 100029, China

    Junying Zhang & Zhiling Hou

  3. Aerospace Science and Industry Wuhan Magnetism-Electron Co. LTD, Wuhan, Hubei, 430073, China

    Zhaohui Liu

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  1. Song Bi
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Bi, S., Zhao, Y., Hou, G. et al. Microwave Absorption and Mechanical Properties of CNTs/ PU Composites with Honeycomb Structure. Appl Compos Mater 29, 1393–1407 (2022). https://doi.org/10.1007/s10443-022-10021-8

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