气凝胶
纤维素
共价键
化学工程
纳米纤维
溶剂
氢键
材料科学
化学
吸水率
有机化学
高分子化学
复合材料
分子
工程类
作者
Yulong Li,Yushang Liu,Yang Liu,Wenchuan Lai,Feng Huang,Anping Ou,Rui Qin,Xiangyang Liu,Xu Wang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-08-03
卷期号:6 (9): 11979-11988
被引量:59
标识
DOI:10.1021/acssuschemeng.8b02284
摘要
The ester cross-linking of cellulose nanofibril (CNF) aerogel was carried out by a facile and highly effective gas–solid fluorinating reaction without the assistance of organic solvent. The fluorination achieved the coexistence of covalent cross-linking and more hydrophilic groups, simultaneously endowing the fluorine-treated CNFs (F-CNFs) aerogel with enduring water-durable and enhanced hydrophilic properties. Hydrogen bond interactions between cellulose nanofibers are replaced by covalent cross-linking of ester bonds, which makes the CNFs aggregate more tightly and thus facilitates the enhancement of mechanical properties of F-CNF aerogel. Meanwhile, the F-CNF aerogel exhibited ultralight weight, excellent mechanical properties (123.4 KPa at 85% strain), and water absorption (123.65 g/g), while having good shape memory performance. What's more, there was not any exotic element introduced into F-CNFs, which can thus maximize the possibility for the final materials to maintain the excellent biological properties of the original CNFs.
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