期刊
CARBOHYDRATE POLYMERS
卷 267, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118220
关键词
Cellulose nanofibrils; Cellulose nanopaper; High pressure homogenization; Deep eutectic solvent; Choline chloride; Citric acid
资金
- National Natural Science Foundation of China [32071720]
- Innovation Project of Excellent Doctorial Dissertation of Tianjin University of Science and Technology [2020005]
- Tianjin Research Innovation Project for Postgraduate Students [2020YJSB119, 2020YJSS130]
- China Scholarship Council [201708120052]
Utilizing a green deep eutectic solvent system for the pretreatment of cellulose fibers can achieve high yield and quality of cellulose nanofibrils. The fabrication of cellulose nanopaper through a vacuum filtration process results in high tensile strength and toughness.
Developing green and simple methods for the preparation of cellulose nanofibrils (CNFs) is of great significance. Herein, a green deep eutectic solvent (DES) system based on choline chloride (ChCl) and citric acid (CA) is employed to pretreat cellulose fibers for the preparation of CNFs. The effect of the pretreatment temperature on the chemo-physical properties of the CNFs is comprehensively investigated. A high CNFs yield of up to 84.19% can be achieved under optimized conditions. The optimal CNFs show a narrow diameter distribution and length up to several microns, high crystallinity and thermal stability, as well as excellent dispersibility in water. Furthermore, semi-transparent and flexible cellulose nanopaper (CNP) was fabricated through a facile vacuum filtration process. The optimal CNP shows high tensile strength (175.15 MPa) and toughness (7.51 MJ/m3). Therefore, this work provides a sustainable and facile approach to fabricate CNFs and CNP, which can be potentially used for various high-tech applications.
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