Journal
CELLULOSE
Volume 23, Issue 1, Pages 439-450Publisher
SPRINGER
DOI: 10.1007/s10570-015-0803-z
Keywords
Cellulose nanocrystal (CNC); Acid hydrolysis; Alkali solubility; S-18; Yield increase
Funding
- National Natural Science Foundation of China [31501440, 31170541]
- China Postdoctoral Science Foundation [2015M571268]
- Special Fund for Agro-scientific Research in the Public Interest [201303071-06]
- Natural Science Foundation of Tianjin City [13JCZDJC29400]
- Tianjin Science and Technology Commission [15JCQNJC14900]
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Cellulose nanocrystal (CNC), as a natural/sustainable material, has attracted considerable attention, and its preparation from the sulfuric acid hydrolysis process has attained the precommercial demonstration stage. In this study, the process was further characterized by following the alkali solubility in an 18 % sodium hydroxide solution (S-18) and the degree of polymerization (DP) of the cellulosic substrate during the sulfuric acid hydrolysis of cotton fibers. The results showed that the S-18 increased as the hydrolysis progressed until reaching a nearly constant level at about 45 min, while the DP exhibited a decrease and approached a nearly constant level at 55 min. The emergence of the constant S-18 coincided with the formation/appearance of CNC; thus, a critical stage with irregular CNC particle size but high yield was identified during the hydrolysis. The optimization of the CNC preparation process was realized under a shortened reaction time with 41.7 % yield (with a CNC size of < 150 nm). Therefore, the amount of S-18 can be used as a new characterization method for the preparation of CNC or other cellulose-derived products during the acid hydrolysis process with the advantage of a favorable product yield.
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