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Shuai Jiang,Amjad Farooq,Fuyi Han,Lifang Liu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
Herein, carboxyl-rich cellulose nanocrystals (CNC) were obtained through a designed TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) mediated oxidation process without any subsequent mechanical treatment, which was provedto be widely suitable for commonly used cellulosic sources, including fibril-like fibers and lignocellulose biomasses. CNCprepared from the acid-free process showed better dispersion stability, less aggregation, higher aqueous UV transmittanceand crystallinity compared with that from sulfuric acid hydrolysis process. Furthermore, the residuals in the insolubleprecipitate were further conducted ultrasonic treatment and extra CNC was obtained from the oxidized cotton and ramiecellulose while cellulose nanofibril (CNF) was extracted from rice straw and pine powder, attributing to their different nativestructures. The total yields of nanocelluloses (NCs) were up to 63.2-68.3 %, improving the utilization ratio of the rawmaterials. This work provided a widely applicable acid- and mechanic-free route in fabricating CNC with inherent carboxylgroups and described an understanding of the relationship between the native structure of raw materials and their products,which is beneficial for improving the application of NCs.
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