University of Oulu

Sirviö, J.A., Isokoski, E., Kantola, A.M. et al. Mechanochemical and thermal succinylation of softwood sawdust in presence of deep eutectic solvent to produce lignin-containing wood nanofibers. Cellulose 28, 6881–6898 (2021).

Mechanochemical and thermal succinylation of softwood sawdust in presence of deep eutectic solvent to produce lignin-containing wood nanofibers

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Author: Sirviö, Juho Antti1; Isokoski, Erkki1; Kantola, Anu M.2;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
2NMR Research Unit, University of Oulu, P.O.Box 3000, 90014, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
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Language: English
Published: Springer Nature, 2021
Publish Date: 2021-06-10


In this study, the effect of the deep eutectic solvent (DES) based on triethylmethylammonium chloride and imidazole on the mechanochemical succinylation of sawdust was investigated. The sawdust was ball milled in the presence of succinic anhydride and the effects of different amounts of the DES on the carboxylic acid content and particle size were studied with and without post-heating. The carboxylic acid content significantly increased with the addition of the DES and by using 1.5 mass excess of the DES compared to sawdust; milled sawdust with 3.5 mmol/g of carboxylic acid groups was obtained using 60 min post-heating at 100 °C. The particle size was found to depend strongly on DES-to-wood ratio and a change in size-reduction characteristics was observed related to fiber saturation point. After mechanochemical milling, three succinylated sawdust samples with different carboxylic acid contents were disintegrated into wood nanofibers and self-standing films were produced. Although the mechanical properties of the films were lower than the cellulose nanofibers, they were higher or in line with oil- and biobased polymers such as polypropene and polylactic acid, respectively. Because of their amphiphilic nature, wood nanofibers were found to be effective stabilizers of water–oil emulsions.

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Series: Cellulose
ISSN: 0969-0239
ISSN-E: 1572-882X
ISSN-L: 0969-0239
Volume: 28
Pages: 6881 - 6898
DOI: 10.1007/s10570-021-03973-w
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Funding: J.A.S. thanks the Kone Foundation for the financial support. This research was conducted as part of the ARVOPURU project granted by the European Regional Development Fund of the European Union and funded by the Council of Oulu Region, Ha-Sa Oy, Junnikkala Oy, Keitele Forest Oy, Kuhmo Oy, Pölkky Oy, and Westas Group Oy. Open access funding provided by University of Oulu including Oulu University Hospital.
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