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

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

103 Citeringar (Scopus)

Sammanfattning

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.
OriginalspråkOdefinierat/okänt
Sidor (från-till)605–612
Antal sidor8
TidskriftCarbohydrate Polymers
Volym133
DOI
StatusPublicerad - 2015
MoE-publikationstypA1 Tidskriftsartikel-refererad

Nyckelord

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

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