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Article

The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall

1
Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE 97187 Luleå, Sweden
2
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE 90187 Umeå, Sweden
3
SweTree Technologies AB, SE 90403 Umeå, Sweden
4
Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Carla Vilela
Nanomaterials 2021, 11(5), 1179; https://doi.org/10.3390/nano11051179
Received: 23 March 2021 / Revised: 20 April 2021 / Accepted: 21 April 2021 / Published: 29 April 2021
Wood from field-grown poplars with different genotypes and varying lignin content (17.4 wt % to 30.0 wt %) were subjected to one-pot 2,2,6,6-Tetramethylpiperidin-1-yl)oxyl catalyzed oxidation and high-pressure homogenization in order to investigate nanofibrillation following simultaneous delignification and cellulose oxidation. When comparing low and high lignin wood it was found that the high lignin wood was more easily fibrillated as indicated by a higher nanofibril yield (68% and 45%) and suspension viscosity (27 and 15 mPa·s). The nanofibrils were monodisperse with diameter ranging between 1.2 and 2.0 nm as measured using atomic force microscopy. Slightly less cellulose oxidation (0.44 and 0.68 mmol·g−1) together with a reduced process yield (36% and 44%) was also found which showed that the removal of a larger amount of lignin increased the efficiency of the homogenization step despite slightly reduced oxidation of the nanofibril surfaces. The surface area of oxidized high lignin wood was also higher than low lignin wood (114 m2·g−1 and 76 m2·g−1) which implicates porosity as a factor that can influence cellulose nanofibril isolation from wood in a beneficial manner. View Full-Text
Keywords: cellulose nanofibrils; wood; lignin; TEMPO-oxidation cellulose nanofibrils; wood; lignin; TEMPO-oxidation
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MDPI and ACS Style

Jonasson, S.; Bünder, A.; Berglund, L.; Hertzberg, M.; Niittylä, T.; Oksman, K. The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall. Nanomaterials 2021, 11, 1179. https://doi.org/10.3390/nano11051179

AMA Style

Jonasson S, Bünder A, Berglund L, Hertzberg M, Niittylä T, Oksman K. The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall. Nanomaterials. 2021; 11(5):1179. https://doi.org/10.3390/nano11051179

Chicago/Turabian Style

Jonasson, Simon, Anne Bünder, Linn Berglund, Magnus Hertzberg, Totte Niittylä, and Kristiina Oksman. 2021. "The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall" Nanomaterials 11, no. 5: 1179. https://doi.org/10.3390/nano11051179

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