Journal
CARBOHYDRATE POLYMERS
Volume 146, Issue -, Pages 26-35Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.03.036
Keywords
Xylan; Carboxymethylation; Charge density; Degree of substitution; Dispersant; Orthogonal design
Categories
Funding
- NSERC
- Canada foundation for Innovation
- Northern Ontario Heritage fund Corporation-Industrial Research Chair
- Canada Research Chair programs
Ask authors/readers for more resources
In this study, carboxymethylated beechwood xylan was produced under alkali conditions using sodium chloroacetate. Taguchi orthogonal design was used to explore the influence of the process parameters, i.e. NaOH concentration, time, temperature, the molar ratio of sodium chloroacetate to xylan and the concentration of the reaction medium on the charge density and degree of substitution (DS) of xylan. Carboxymethylated xylan (CMX) with the maximum charge density of 1.62 meq/g and DS of 0.21 was produced under the optimal conditions of 0.75M NaOH concentration, 1.0 mol/mol sodium chloroacetate (SCA)/xylan ratio, 2 h reaction time, 70 degrees C and 15 g/L xylan concentration. The carboxylate group of the product was 1.48 mmol/g. The attachment of the carboxymethylated group to xylan was confirmed by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (H-1 NMR) spectroscopy. The molecular weight of xylan increased and its thermal stability was improved via carboxymethylation. The dispersion performance of the carboxymethylated xylan in clay suspensions was determined by photometric dispersion analyzer (PDA). CMX showed better performance than sodium carbonate-polyacrylic acid (Na2CO3-PAA) in dispersing the clay suspension. The unmodified xylan did not show any dispersion performance. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available