Cellulose nanocrystals prepared via formic acid hydrolysis followed by TEMPO-mediated oxidation

Li Bin, Chunlin Xu, Dennis Kronlund, Anni Määttänen, Jun Liu, Jan-Henrik Smått, Jouko Peltonen, Stefan Willför, Mu Xindong, Wen Yang Xu

Research output: Contribution to journalArticleScientificpeer-review

109 Citations (Scopus)

Abstract

Cellulose nanocrystals (CNCs) as a renewable and biodegradable nanomaterial have wide application value. In this work, CNCs were extracted from bleached chemical pulp using two stages of isolation (i.e. formic acid (FA) hydrolysis and 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO) mediated oxidation) under mild conditions. In the first stage, FA was used to remove hemicellulose, swell cellulose fibers, and release CNCs. The FA could be readily recovered and reused. In the second stage, the CNCs isolated by FA were further modified by TEMPO-mediated oxidation to increase the surface charge of CNCs. It was found that the modified CNCs with more ordered crystal structure and higher surface charge had better redispersibility and higher viscosity in aqueous phase. Therefore, the modified CNCs could be more effective when used as rheology modifier in the fields of water based coating, paint, food etc.
Original languageUndefined/Unknown
Pages (from-to)605–612
Number of pages8
JournalCarbohydrate Polymers
Volume133
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • Cellulose nanocrystals
  • Characterization
  • Formic acid
  • Rheology
  • TEMPO oxidation

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