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Green and low-cost production of thermally stable and carboxylated cellulose Nanocrystals and nanofibrils using highly recyclable dicarboxylic acidsAuthor(s): Huiyang Bian; Liheng Chen; Ruibin Wang; Junyong Zhu
Source: Journal of Visualized Experiments(119):1-7.
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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DescriptionHere we demonstrate potentially low cost and green productions of high thermally stable and carboxylated cellulose nanocrystals (CNCs) and nanofibrils (CNF) from bleached eucalyptus pulp (BEP) and unbleached mixed hardwood kraft pulp (UMHP) fibers using highly recyclable dicarboxylic solid acids. Typical operating conditions were acid concentrations of 50 - 70 wt% at 100 °C for 60 min and 120 °C (no boiling at atmospheric pressure) for 120 min, for BEP and UMHP, respectively. The resultant CNCs have a higher thermal degradation temperature than their corresponding feed fibers and carboxylic acid group content from 0.2 - 0.4 mmol/g. The low strength (high pKa of 1.0 - 3.0) of organic acids also resulted in CNCs with both longer lengths of approximately 239 - 336 nm and higher crystallinity than CNCs produced using mineral acids. Cellulose loss to sugar was minimal. Fibrous cellulosic solid residue (FCSR) from the dicarboxylic acid hydrolysis was used to produce carboxylated CNFs through subsequent mechanical fibrillation with low energy input.
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CitationBian, Huiyang; Chen, Liheng; Wang, Ruibin; Zhu, Junyong. 2016. Green and low-cost production of thermally stable and carboxylated cellulose nanocrystals and nanofibrils using highly recyclable dicarboxylic acids. Journal of Visualized Experiments. e55079. pp. 1-7.
KeywordsCellulose Nanomaterials, Cellulose nanocrystals (CNC), Cellulose nanofibrils (CNF), Di-carboxylic acid hydrolysis, Acid recovery, Thermal stability, Dispersion, Surface carboxylation
- Highly thermal-stable and functional cellulose nanocrystals and nanofibrils produced using fully recyclable organic acids
- Using a fully recyclable dicarboxylic acid for producing dispersible and thermally stable cellulose nanomaterials from different cellulosic sources
- Strong and Optically Transparent Films Prepared Using Cellulosic Solid Residue Recovered from Cellulose Nanocrystals Production Waste Stream
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