锤子
Here we report the production of highly thermal stable and functional cellulose nanocrystals (CNC) and nanofibrils (CNF) by hydrolysis using concentrated organic acids. Due to their low water solubility, these solid organic acids can be easily recovered after hydrolysis reactions through crystallization at a lower or ambient temperature. When dicarboxylic acids were used, the resultant CNC surface contained carboxylic acid groups which facilitate functionalization and dispersion in aqueous processing. Carboxylic acid group content was 0.1 – 0.4 mmol/g for CNC produced from a bleached eucalyptus kraft pulp (BEP) using oxalic acid at concentrations of 50 – 70 wt%.
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