期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 9, 页码 11979-11988出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b02284
关键词
Cellulose nanofibrils; Ester crosslinking; Hydrophilicity; Fluorination; Water-durable
资金
- National Natural Science Foundation of China [51803129, 51633004]
- National Key Research and Development Plan [2017YFB0404701]
- Program of Science and Technology of Sichuan Province [2017GZ0127]
- State Key Laboratory of Polymer Materials Engineering [sklpme2018-3-08]
- Fundamental Research Funds for the Central Universities
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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