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<p>In this study, a cellulose composite aerogel (TM/LDH-CA) with efficient smoke suppression and flame retardancy was constructed through a multi-level interface engineering strategy by integrating tea polyphenol (TP) and layered double hydroxide (LDH). LDH, acting as a two-dimensional barrier to alleviate the thermal decomposition of cellulose, was exfoliated and homogeneously employed with cellulose chains via hydrogen bonding. Meanwhile, TP, serving as a gas barrier to quench combustion reactions, was anchored on the surface of TM/LDH-CA through the complexation of Mg<sup>2+</sup> and hydrogen bond interaction. Through their synergistic effect, a high-quality continuous char layer rich in pores were rapidly formed when heating. The residue of TM/LDH-CA at 800&#xa0;°C was 21.89% in air, which could effectually obstruct the transfer of heat and gaseous substances. As a result, its limiting oxygen index (LOI) was as high as 33.26% and could self-extinguish rapidly within 2&#xa0;s once removed from the fire. Furthermore, the heat release rate peak (pHRR) and total smoke release (TSR) during combustion was reduced by 29.38 and 92.90%, respectively, compared to CA, demonstrating its excellent fire safety.</p>

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Multi-level interface engineering strategy enables cellulose composite aerogels with exceptional smoke suppression and flame retardancy

  • 期刊论文

  • 发表日期：

    2025年11月29日

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  • Xiaolei Luo,
  • Linyue He,
  • Xinxin Chen,
  • Mengxiang Dang,
  • Yusong Xu,
  • Lin Liu,
  • Yurong Cai,
  • Juming Yao

摘要

In this study, a cellulose composite aerogel (TM/LDH-CA) with efficient smoke suppression and flame retardancy was constructed through a multi-level interface engineering strategy by integrating tea polyphenol (TP) and layered double hydroxide (LDH). LDH, acting as a two-dimensional barrier to alleviate the thermal decomposition of cellulose, was exfoliated and homogeneously employed with cellulose chains via hydrogen bonding. Meanwhile, TP, serving as a gas barrier to quench combustion reactions, was anchored on the surface of TM/LDH-CA through the complexation of Mg2+ and hydrogen bond interaction. Through their synergistic effect, a high-quality continuous char layer rich in pores were rapidly formed when heating. The residue of TM/LDH-CA at 800 °C was 21.89% in air, which could effectually obstruct the transfer of heat and gaseous substances. As a result, its limiting oxygen index (LOI) was as high as 33.26% and could self-extinguish rapidly within 2 s once removed from the fire. Furthermore, the heat release rate peak (pHRR) and total smoke release (TSR) during combustion was reduced by 29.38 and 92.90%, respectively, compared to CA, demonstrating its excellent fire safety.