TEMPO-mediated surface oxidation of cellulose nanocrystals (CNCs)

Cellulose nanocrystals were successfully oxidized with sodium hypochlorite using catalytic amounts of sodium bromide and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical at pH 10 in water. Carboxylate groups were selectively introduced at the surface of the crystals up to a total acid content of...

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Bibliographic Details
Published in:Cellulose (London) 2017-07, Vol.24 (7), p.2775-2790
Main Authors: Fraschini, Carole, Chauve, Grégory, Bouchard, Jean
Format: Article
Language:English
Subjects:
Bioorganic Chemistry
Catalysis
Catalysts
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Damage
Emission analysis
Field emission microscopy
Glass
Infrared analysis
Infrared spectroscopy
Integrity
Nanocrystals
Natural Materials
Organic Chemistry
Original Paper
Oxidation
Physical Chemistry
Polymer Sciences
Reaction kinetics
Reflectance
Scanning electron microscopy
Sodium bromides
Sodium hypochlorite
Spectroscopic analysis
Sustainable Development
Temperature effects
Thermogravimetric analysis
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Summary:Cellulose nanocrystals were successfully oxidized with sodium hypochlorite using catalytic amounts of sodium bromide and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical at pH 10 in water. Carboxylate groups were selectively introduced at the surface of the crystals up to a total acid content of 1200 mmol kg −1 without damaging the integrity of the crystals. The final acid content can easily be tuned by varying the amount of oxidant introduced. The effect of temperature, the quantity of oxidant and co-catalyst on the reaction kinetics were studied. Several methods were used for the characterization of the oxidized material like field emission scanning electron microscopy, diffuse reflectance infrared spectroscopy and thermogravimetric analysis.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-017-1319-5