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Acid-Free Preparation of Cellulose Nanocrystals by TEMPO Oxidation and Subsequent Cavitation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). The University of Tokyo, Japan.ORCID iD: 0000-0002-5702-0681
Number of Authors: 4
2018 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 19, no 2, p. 633-639Article in journal (Refereed) Published
Abstract [en]

Softwood bleached kraft pulp (SBKP) and microcrystalline cellulose (MCC) were oxidized using a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated system. The TEMPO-oxidized SBKP prepared with 10 mmol/g NaClO (SBKP-10) had a higher mass recovery ratio and higher carboxylate content than the other prepared celluloses including the TEMPO-oxidized MCCs. The SBKP-10 was then exposed to cavitation-induced forces through sonication in water for 10-120 min to prepare aqueous dispersions of needle-like TEMPO-oxidized cellulose nanocrystals (TEMPO-CNCs) with homogeneous width of 3.5 to 3.6 nm and average lengths of similar to 200 nm. The average chain lengths of the cellulose molecules that make up the TEMPO-CNCs were less than half the average lengths of the TEMPO-CNCs. Compared with conventional CNCs prepared by acid hydrolysis, the TEMPO-CNCs prepared by the acid-free and dialysis-free process exhibited higher mass recovery ratios, significantly higher amounts of surface anionic groups, and smaller and more homogeneous widths.

Place, publisher, year, edition, pages
2018. Vol. 19, no 2, p. 633-639
National Category
Biological Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-153624DOI: 10.1021/acs.biomac.7b01730ISI: 000425193600037PubMedID: 29283555OAI: oai:DiVA.org:su-153624DiVA, id: diva2:1189856
Available from: 2018-03-13 Created: 2018-03-13 Last updated: 2018-03-13Bibliographically approved

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