The non-trivial role of native xylans on the preparation of TEMPO-oxidized cellulose nanofibrils |
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| Affiliation: | 1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China;2. Qilu University of Technology, Key Laboratory of Pulp & Paper Science and Technology of the Ministry of Education, Jinan 250353, China;3. The Laboratory of Soft Materials & Green Chemistry, Departments of Chemistry, Wood & Paper Science, North Carolina State University, Raleigh, NC 27695, USA;1. Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Applied Wood Materials, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;2. Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Bioactive Materials, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland;3. Adolphe Merkle Institute, Polymer Chemistry and Materials, University of Fribourg, Rte de l’Ancienne Papeterie, CH-1723 Marly 1, Switzerland;4. Frewitt Fabrique des Machines SA, Case postale 615, 1701 Fribourg, Switzerland;5. Virginia Tech, Department of Materials Science & Engineering, 445 Old Turner Street, 213 Holden Hall, Blacksburg, VA 24061, USA;1. Aalto University, School of Chemical Technology, Department of Forest Products Technology, P.O. Box 16300, 00076 Espoo, Finland;2. UPM, Tekniikantie 2 C, 02150 Espoo, Finland;1. School of Engineering, Zhejiang Agriculture and Forestry University, Lin’an, Hangzhou, Zhejiang Province 31130, PR China;2. National Engineering and Technology Research Center of Wood-based Resources Comprehensive Utilization, Lin’an, Hangzhou, Zhejiang Province 311300, PR China;1. Department of Sustainable Bioproducts, Mississippi State University, Box 9820, Mississippi State, MS 39762, USA;2. Department of Food Science, Nutrition & Health Promotion and Coastal Research & Extension Center, Mississippi State University, 3411 Frederic St., Pascagoula, MS 39567, USA;1. Department of Chemical Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan;2. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan;3. Department of Environmental Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan |
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| Abstract: | Cellulose nanofibrils have become increasingly prized as a raw material toward the preparation of composites due to their specific surface character and biocompatibility. TEMPO-mediated oxidation with post-mechanical treatment has been proposed as a promising method for the preparation of cellulose nanofibrils from cellulosic raw materials. In the current study it was found that the native hemicellulosic components in the raw material played a pivotal chemical role on the kinetics of generation of TEMPO-oxidized cellulose nanofibrils (TOCNs), as well as on thermal stability, and transmittance. The removal of xylans from the original feedstock facilitated not only an increase in both the carboxylate content and water retention value of the TEMPO-oxidized fibers, but also improved the transmittance of subsequently obtained TOCNs suspensions. It was also determined that the presence of xylans in the cellulosic feedstock hindered chemical accessibility through a barrier mechanism in which the TEMPO-mediated oxidation reaction rate was reduced. |
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| Keywords: | Hemicellulose TEMPO-oxidized cellulose nanofibrils Xylanase Alkali |
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