Journal
CARBOHYDRATE POLYMERS
Volume 180, Issue -, Pages 81-87Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.09.010
Keywords
Chitin; Nanofibers; Esterification; Ultrasound treatment
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Funding
- National Natural Science Foundation of China [51273083, 51405188]
- China Postdoctoral Science Foundation [2015T80307]
- Graduate Innovation Fund of Jilin University [2017038]
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Chitin nanofibers were prepared from commercially available chitin powder via esterification modification and subsequent ultrasound treatment. The obtained chitin nanofibers were characterized using dynamic light scattering (DLS), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), C-13 CP-MAS (cross-polarization under magic-angle spinning) solid state nuclear magnetic resonance (NMR), elemental analysis, and Xray diffraction (XRD). Results showed that the esterification of chitin with maleic anhydride significantly improved the ultrasound disintegration of chitin fibrils into nanofibers. With increasing power and time, the ultrasound treatment yielded smaller chitin nanofibers with narrower size distribution, and the diameter of the chitin nanofibers could reach similar to 15 nm. The effect of the ultrasound treatment on degree of acetylation and degree of substitution of the chitin nanofibers was negligible. However, crystallinity of the chitin nanofibers increased with increase in power and time of the ultrasound treatment.
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