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| Preparation and Characterization of Cellulose Nanofibers by Supercritical Pretreatment-Ball Milling |
| Received:August 09, 2021 |
| DOI：10.11981/j.issn.1000-6842.2022.02.09 |
| Key Words:cellulose nanofiber （CNF）;micro-fibrotic cellulose （MFC）;supercritical CO2/ethanol;ball milling |
| Fund Project:浙江省26县绿色专项（2021C02031）；浙江省公益技术研究项目（LGG19C160001）；浙江省重点研发项目（2019C01156）；国家自然科学基金项目（21808209）。 |
| Author Name | Affiliation | Postcode | | HUANG Guanhong* | School of Environmental and Natural Resource， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 | 310023 | | LUO Huaying | Xianhe Corp.， Quzhou， Zhejiang Province， 324022 | 324022 | | GUI Renbing | Xianhe Corp.， Quzhou， Zhejiang Province， 324022 | 324022 | | HU Zhijun | School of Environmental and Natural Resource， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 | 310023 | | CAO Xinyu | School of Environmental and Natural Resource， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 | 310023 | | GUO Daliang | School of Environmental and Natural Resource， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 | 310023 | | LIN Jiang | School of Environmental and Natural Resource， Zhejiang University of Science and Technology， Hangzhou， Zhejiang Province， 310023 | 310023 |
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| Abstract: |
| Cellulose nanofiber （SCB-CNF） was prepared from micro-fibrotic cellulose （MFC） by supercritical CO2/ethanol pretreatment combined with ball milling. The effects of supercritical CO2/ethanol pretreatment conditions on MFC were explored and SCB-CNF was further compared with cellulose nanofiber （TMH-CNF） prepared by 2，2，6，6-tetramethylpiperidine-1-oxygen radical （TEMPO） pretreatment combined with microfluidics homogenization （TMH）. The as-prepared CNFs were characterized by scanning electron microscopy （SEM）， field emission scanning electron microscopy （FE-SEM）， X-ray diffractometer （XRD）， and thermogravimetric （TG） analysis. The results showed that the MFC bundle was decomposed into single fiber by supercritical CO2/ethanol pretreatment， and the length and diameter of which were significantly reduced. The crystallinity of cellulose （P-MFC） pretreated by supercritical CO2/ethanol increased firstly and then decreased along with the variation in pretreatment time and temperature. Compared with TMH-CNF， the needle-like SCB-CNF is of higher thermal stability and crystallinity， shorter length， and is easier to be dispersed， exhibiting potential application value in composite materials， biomedicine （drug delivery）， and other fields. |
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