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<p>Currently, most aerogel preparation is prepared by suspension lyophilization and high-temperature carbonization. Such preparation methods are complicated and difficult to control. In response to this problem, this study adopted silane coupling agent KH570 to modify carbon nanotubes (CNTs) and improve its dispersion stability. Modified CNTs were introduced into the acrylic/acrylamide prepolymerization system, and a three-dimensional network hydrogel was constructed through free radical polymerization and crosslinking. Ultralight copolymer aerogels (density 0.10766&#xa0;g/cm<sup>3</sup>) were prepared in combination with a freeze-drying process. BET analysis shows that the pore wall is rich in mesoporous, providing the basis for electromagnetic wave multiple reflections and interface polarization losses. By optimizing the CNTs addition, it was found that at 5% content, the aerogel achieves excellent performance at an ultra-thin thickness of 1.15&#xa0;mm: the minimum reflection loss is −&#xa0;54.8&#xa0;dB, the effective absorption bandwidth is up to 4.13&#xa0;GHz (13.87–18&#xa0;GHz), effectively improving the height of traditional materials The problems of density and narrow bandwidth meet the needs of "light, thin, wide and strong" wave absorption. Its low-temperature environmental protection technology is both scalable, providing new strategies for the development of high-performance wave-absorbing materials in the fields of 5G communications, military stealth, etc., and has important application value.</p>

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High-performance microwave absorbing aerogels based on polyacrylic acid-polyacrylamide-modified carbon nanotubes

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Shen Su,
  • Ying Zhang,
  • Yang Zhang,
  • Shuangshuang Yang,
  • Xingwei Wang,
  • Leilei Li,
  • Qiangliang Yu

摘要

Currently, most aerogel preparation is prepared by suspension lyophilization and high-temperature carbonization. Such preparation methods are complicated and difficult to control. In response to this problem, this study adopted silane coupling agent KH570 to modify carbon nanotubes (CNTs) and improve its dispersion stability. Modified CNTs were introduced into the acrylic/acrylamide prepolymerization system, and a three-dimensional network hydrogel was constructed through free radical polymerization and crosslinking. Ultralight copolymer aerogels (density 0.10766 g/cm3) were prepared in combination with a freeze-drying process. BET analysis shows that the pore wall is rich in mesoporous, providing the basis for electromagnetic wave multiple reflections and interface polarization losses. By optimizing the CNTs addition, it was found that at 5% content, the aerogel achieves excellent performance at an ultra-thin thickness of 1.15 mm: the minimum reflection loss is − 54.8 dB, the effective absorption bandwidth is up to 4.13 GHz (13.87–18 GHz), effectively improving the height of traditional materials The problems of density and narrow bandwidth meet the needs of "light, thin, wide and strong" wave absorption. Its low-temperature environmental protection technology is both scalable, providing new strategies for the development of high-performance wave-absorbing materials in the fields of 5G communications, military stealth, etc., and has important application value.