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Title: Green and low-cost production of thermally stable and carboxylated cellulose Nanocrystals and nanofibrils using highly recyclable dicarboxylic acids

Source: Journal of Visualized Experiments(119):1-7.

Author(s)Bian, Huiyang; Chen, Liheng; Wang, Ruibin; Zhu, Junyong

Publication Year: 2016  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-2B

Abstract: Here 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.

Keywords: Cellulose Nanomaterials, Cellulose nanocrystals (CNC), Cellulose nanofibrils (CNF), Di-carboxylic acid hydrolysis, Acid recovery, Thermal stability, Dispersion, Surface carboxylation

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 03/01/2017

This publication is also viewable on Treesearch:  view
RITS Product ID: 84181
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer
  

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