Effect of high‐temperature degumming on the constituents and structure of cotton stalk bark fibers

Abstract

The high‐temperature degumming technology of cotton stalk bark fiber was studied, and the effects of the caustic soda concentration on the constituents, structure, and thermal degradation of the cotton stalk bark fiber were examined. The morphology, structure, and thermal degradation of the cotton stalk bark fiber after high‐temperature degumming were investigated through scanning electron microscopy, Fourier transform infrared (FTIR) spectroscopy, wide‐angle X‐ray diffraction, and thermogravimetric analysis. The results indicate that the high‐temperature degumming process was effective for removing hemicelluloses and lignin and could improve the thermal stability of the cellulose. The raw and degummed cotton stalk bark fibers both showed the structure of cellulose I, according to the FTIR spectroscopy and X‐ray diffraction results. It was interesting to note that the crystallinity and crystallinity index were related to the caustic soda concentration. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Steam explosion distinctively enhances biomass enzymatic saccharification of cotton stalks by largely reducing cellulose polymerization degree in G. barbadense and G. hirsutum

“…In addition, cotton stalks could be used to manufacture pulp (Zheng et al, 2012), thermal insulation http://dx.doi.org/10.1016/j.biortech.2015.01.020 0960-8524/Ó 2015 Elsevier Ltd. All rights reserved. fiberboard (Zhou et al, 2012), and activated carbons (El-Hendawy et al, 2008;Ozdemir et al, 2011). Despite cotton stalk is lignocellulose-rich biomass, little is yet reported about its applications in biofuel production.…”

Mechanical and water absorption behaviors of corn stalk/sisal fiber‐reinforced hybrid composites

“…A strong peak at 1250 cm −1 is ascribed to the CO stretching vibration of hemicelluloses component and aryl‐alkyl ether compounds present in lignin . Because WF contains more cellulose than CSF, the FTIR spectrum of WF shows a strong peak at 1432 cm −1 , which is attributed to the cellulose structure of WF . Comparing with CSF, however, WF presents weak peak around 1635 cm −1 , which suggests that there are lower contents of carbonyl groups contained in WF.…”

Tensile and fatigue characterisation of textile cotton waste/polypropylene laminates

“…However, the problem appears far to be resolved for the specific properties (high hydrophilicity, tendency of flocks to accumulate disorderly on a surface) of cotton waste. On a positive note, it is important to consider that high temperature degumming, which is a typical industrial procedure, involving mercerization with sodium hydroxide, leads to a virtually complete removal of lignin and hemicellulose and to the almost exclusive presence of crystalline cellulose I in cotton fibres [14]. This would suggest that employing waste cotton from textile products as filler in polymer matrices could have some merit, also in terms of providing a second life to textile waste, therefore resulting in a reduction of relevant environmental impact, especially when the matrix itself is obtained from industrial waste [15].…”