Influence of solvent polarity on surface-fluorination of cellulose nanofiber by ball milling

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• 作者：Xianmeng Rao ; Shigenori Kuga ; Min Wu ; Yong Huang
• 关键词：Nanocellulose ; Fluorination ; Solvent polarity ; Ball milling ; Hydrophobicity
• 刊名：Cellulose
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：4
• 页码：2341-2348
• 全文大小：1,132 KB
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• 作者单位：Xianmeng Rao (1) (2)
  Shigenori Kuga (1)
  Min Wu (1)
  Yong Huang (1)
  
  1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, People’s Republic of China
  2. University of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Bioorganic Chemistry
  Physical Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-882X

文摘

Ball mill-assisted surface-fluorination of cellulose nanofiber was studied for two solvents with different polarity as dispersion/reaction medium. Milling cellulose in neat toluene gave irregular-shaped decrystallized cellulose particles; addition of pentafluorobenzoyl chloride (PFBC) to the system gave partially fluorinated cellulose as thin flakes with smooth surfaces, which maintained original crystallinity. Milling in neat dimethyl formamide (DMF) caused partial dispersion of nanofibers without decrystallization; milling in PFBC/DMF gave more enhanced dispersion of surface-fluorinated nanofibers. Both fluorinated materials were hydrophobic, with water contact angles of 103°-13°. Bulk degree of esterification was 0.20 for toluene and 0.57 for DMF systems. These results show characteristic influences of solvent species in reactive ball milling of cellulose in terms of fibrillation and surface esterification of nanofibers.