Abstract
Aqueous-phase surface modification of nanocellulose is desirable because nanocellulose is generally produced via water-based fibrillation. In this study, a hydrogen bond–induced surface modification of cellulose nanofibrils (CNFs) in water was developed. Tannic acid and polyvinylpyrrolidone were chosen to modify the CNFs because of their strong capacity for hydrogen bond formation. By tuning the hydrogen bond formation between CNFs, tannic acid, and polyvinylpyrrolidone, CNFs with different surface hydrophilicity were achieved. The modified CNFs can assemble into strong and tough composites owing to the hydrogen bond network in the system. Modified CNFs demonstrated 76% higher tensile strength and 100% higher toughness than those of unmodified CNFs, reaching 162 MPa and 12.7 MJ/m3, respectively. This study provides a new water-based modification strategy for the nanocellulose, leading the way toward producing strong nanocellulose composites via noncovalent interaction.
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Acknowledgements
This research is sponsored by the US Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle LLC. Scanning electron microscopy studies were completed at the Center for Nanophase Materials Sciences, a DOE Office of Science User Facility. The authors would like to thank Dr. Harry Meyer for his help on X-ray photoelectron spectroscopy measurement, and Rick R. Lowden for the access to mechanical testing.
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Li, K., Li, Y., Tekinalp, H. et al. Hydrogen bond–induced aqueous-phase surface modification of nanocellulose and its mechanically strong composites. J Mater Sci 57, 8127–8138 (2022). https://doi.org/10.1007/s10853-022-07161-4
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DOI: https://doi.org/10.1007/s10853-022-07161-4