Journal
CARBOHYDRATE POLYMERS
Volume 98, Issue 1, Pages 444-450Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.06.033
Keywords
TEMPO-mediated oxidation; Lyocell fibers; Gel permeation chromatography (GPC); Molecular weight distribution (MWD); Fluorescence labeling; Functional group profiles
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Funding
- Ministry of Education and Science and Technological Development of the Republic of Serbia [01 172029]
- COST Action [FP 0901]
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The effects of TEMPO-mediated oxidation, performed with NaClO, a catalytic amount of NaBr, and 2,2',6,6'-tetramethylpiperidine-1-oxy radical (TEMPO), were studied on lyocell fibers by means of GPC using multiple detection and group-selective fluorescence labeling according to the CCOA and FDAM methodology. The applied method determines functional group content as a sum parameter, as well as functional group profiles in relation to the molecular weight of the cellulose fibers. Both the CHO and COOH profiles, as well as molecular weight alterations, were analyzed. A significant decrease in the average molecular weight was obtained during the first hour of TEMPO-mediated oxidation, but prolonged oxidation time resulted in no strong additional chain scission. Significant amounts of COOH groups were introduced in the high molecular weight fractions by the oxidation with higher concentrations of NaClO (2.42-9.67 mmol NaClO/g fiber) after modification times of 1 h or longer. (C) 2013 Elsevier Ltd. All rights reserved.
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