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Analyzing TEMPO-Oxidized Cellulose Fiber Morphology: New Insights into Optimization of the Oxidation Process and Nanocellulose Dispersion Quality

Jaka LevaničDepartment of Wood Materials Science, School of Forest Sciences, Faculty of Science and Forestry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, FI-80100 Joensuu, FinlandVladimira Petrovič ŠenkDepartment of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, SloveniaPeter NadrahSlovenian National Building and Civil Engineering Institute, Dimičeva ulica 12, 1000 Ljubljana, SloveniaIda PoljanšekDepartment of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, SloveniaPrimož OvenDepartment of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, SloveniaAntti HaapalaDepartment of Wood Materials Science, School of Forest Sciences, Faculty of Science and Forestry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, FI-80100 Joensuu, Finland

2020en

ABI

Annotatsiya

High-definition automated optical analysis was used to observe the morphological changes of bleached hardwood dissolving pulp during oxidation mediated by (2,2,6,6-tetramethylpiperidn-1-yl)oxyl (TEMPO). The effects of TEMPO treatment kinetics on fiber morphology and fibrillation degree at a constant reagent loading were studied. The pulp underwent significant swelling, and carboxyl groups were introduced in which the fiber cell walls loosened, which contributed to fibrillation and subsequently nanocellulose dispersion quality in terms of both viscosity and visible light transmittance. The use of an automated optical fiber analyzer facilitates process control, as it allows controlling the fiber morphology and preventing major losses in the form of pulp fines stemming from an unnecessarily long TEMPO oxidation time.

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DOI: 10.1021/acssuschemeng.0c05989

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