Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (12): 1588-1598.DOI: 10.19894/j.issn.1000-0518.210120

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Microwave Absorption Properties of Co/C and Microwave-Heat Conversion Properties of Co/C-Polyurethane Phase Change Composites

WU Qiu-Ping1,2, CAI Kun-Ting3, WANG Yuan-Kang4, SUN Kai1,2, YANG Jin-Bo4, HAN Song-Bai5*, LIU Yun-Tao 1,2*   

  1. 1(Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China)
    2(National Key Laboratory for Metrology and Calibration Techniques, China Institute of Atomic Energy, Beijing 102413, China )
    3(Department of Material Science and Engineering, Peking University, Beijing 100871, China)
    4(College of Physics, Peking University, Beijing 100871, China)
    5(Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China)
  • Received:2021-03-17 Revised:2021-06-26 Published:2021-12-01 Online:2022-02-01
  • Supported by:
    National Key R&D Program of China (No.2017YFA0403701)

Abstract: In this paper, a Co/C carbon-based composite material with excellent microwave absorption properties was successfully prepared by pyrolyzing metal-organic framework ZIF-67. The sample with a mass fraction of 35% of absorbent obtained at a pyrolysis temperature of 600 ℃ has a minimum reflection loss of -54.30 dB and its thickness is only 1.75 mm. By analyzing the microwave absorption characteristics of the sample′s loss capability and impedance matching, it is found that the skeleton structure in the composite material has a great influence on its impedance matching performance. And the uniformly dispersed Co/C-polyurethane (PU) phase change composite material was prepared by in-situ composite method, and its microwave-thermal conversion performance was preliminarily studied. The amount of added microwave absorbent has a significant effect on its microwave-heat conversion performance, and the heating efficiency increases exponentially with the added amount. The Co/C-PU phase change composite material studied in this paper has great application potential in electromagnetic shielding, radar and infrared compatible stealth. In addition, solid-solid phase change materials combined with the rapid and high-efficiency characteristics of microwave heating effects have unique advantages when used for energy storage or other thermal applications.

Key words: Microwave absorption materials, Phase change materials, Metal-organic frameworks, Polyurethane, Microwave-heat transportation

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