Wu Zhengsong, Gao Yucheng, Nie Shibin, Zhao Dongyue, Cheng Xudong
School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.
School of Public Security and Emergency Management, Anhui University of Science and Technology, Hefei 231131, China.
Polymers (Basel). 2025 Aug 31;17(17):2377. doi: 10.3390/polym17172377.
Cellulose aerogel is a promising thermal insulation material with terrific thermal insulation and environmental friendliness. However, the intrinsic flammability of polysaccharide molecules and dependence on freeze-drying have limited its application in flame-retardant and thermal management systems. Here, we develop a flame-retardant biomass aerogel based on a dual-network matrix of bacterial cellulose and sodium alginate. This innovative material enables high-efficiency and low-cost preparation via ambient pressure drying technology (only ~3.5% volume shrinkage), while achieving flame retardancy by introducing an inorganic nanosheet microstructure within a polymer matrix. The resulting dual-network flame-retardant cellulose aerogel demonstrates thermal performance superior to that of most polymer foams and conventional cellulose aerogels, featuring an ultra-low thermal conductivity of ~0.04 W m K and a high limiting oxygen index (LOI) of ~69%. This research provides a novel strategy for simultaneous flame-retardant modification and energy-efficient manufacturing of biomass-derived aerogels.
纤维素气凝胶是一种很有前途的保温材料，具有出色的保温性能和环境友好性。然而，多糖分子固有的可燃性以及对冷冻干燥的依赖限制了其在阻燃和热管理系统中的应用。在此，我们基于细菌纤维素和海藻酸钠的双网络基质开发了一种阻燃生物质气凝胶。这种创新材料通过常压干燥技术实现了高效低成本制备（体积收缩仅约3.5%），同时通过在聚合物基质中引入无机纳米片微结构实现了阻燃性。所得的双网络阻燃纤维素气凝胶表现出优于大多数聚合物泡沫和传统纤维素气凝胶的热性能，具有约0.04 W m K的超低热导率和约69%的高极限氧指数（LOI）。这项研究为生物质衍生气凝胶的同时阻燃改性和节能制造提供了一种新策略。
