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

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Bin Li, Wenyang Xu, Dennis Kronlund, Anni Määttänen, Jun Liu, Jan-Henrik Smått, Jouko Peltonen, Stefan Willför, Xindong Mu, Chunlin Xu
Publisher: ELSEVIER SCI LTD
Publication year: 2015
Journal: Carbohydrate Polymers
Journal acronym: CARBOHYD POLYM
Volume number: 133
Start page: 605
End page: 612
Number of pages: 8
ISSN: 0144-8617
eISSN: 1879-1344


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.


Keywords

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

Last updated on 2019-15-10 at 03:09