Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2021-12-24 , DOI: 10.1016/j.jtice.2021.104159 Jiali Huang 1 , Xin Wang 1 , Wenwen Guo 1, 2 , Haoxin Niu 1 , Lei Song 1 , Yuan Hu 1
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Background
Eco-friendly thermally insulating cellulose aerogels made from environmentally friendly resources are very attractive in materials chemistry, but the high flammability limits their application.
Method
Herein, a novel phosphorus-containing flame retardant modifying agent (DOPO-IA) was incorporated into the cellulose nanofiber aerogel and the cellulose composite aerogels were prepared by esterification and followed by a freeze-drying process.
Findings
The thermal conductivity of the resultant cellulose composite aerogels was in the range of 28.6–31.2 mW/(mK). Meanwhile, the cellulose aerogels modified with DOPO-IA showed significantly enhanced thermal stability, mechanical property, and flame retardant performance compared with the pure cellulose aerogel. The CNF-DI-3 showed a high char residue (19.8 wt%) at 700 °C, which was 187% higher than CNF. Specifically, CNF-DI-3 exhibited remarkable reductions in its PHRR and THR values which were 67% and 60%, respectively, as compared to those of CNF. In summary, it is of significance to synthesize mechanically robust and flame-retardant cellulose aerogels.
中文翻译：
具有优异阻燃性、机械性能和热稳定性的环保型隔热纤维素气凝胶
背景
由环保资源制成的环保隔热纤维素气凝胶在材料化学方面非常有吸引力，但其高可燃性限制了其应用。
方法
在此，将新型含磷阻燃改性剂（DOPO-IA）掺入纤维素纳米纤维气凝胶中，通过酯化和冷冻干燥工艺制备纤维素复合气凝胶。
发现
所得纤维素复合气凝胶的热导率在 28.6-31.2 mW/(mK) 范围内。同时，与纯纤维素气凝胶相比，经 DOPO-IA 改性的纤维素气凝胶显示出显着增强的热稳定性、机械性能和阻燃性能。CNF-DI-3 在 700 °C 下显示出高炭残留（19.8 wt%），比 CNF 高 187%。具体而言，与 CNF 相比，CNF-DI-3 的 PHRR 和 THR 值显着降低，分别为 67% 和 60%。总之，合成机械坚固且阻燃的纤维素气凝胶具有重要意义。
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