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Gewählte Publikation:

Milanovic, J; Schiehser, S; Milanovic, P; Potthast, A; Kostic, M.
(2013): Molecular weight distribution and functional group profiles of TEMPO-oxidized lyocell fibers
CARBOHYD POLYM. 2013; 98(1): 444-450. FullText FullText_BOKU

Abstract:
The effects of TEMPO-mediated oxidation, performed with NaClO, a catalytic amount of NaBr, and 2,2xxx,6,6xxx-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.
Autor/innen der BOKU Wien:
Potthast Antje
Schiehser Sonja
BOKU Gendermonitor:

Find related publications in this database (using NML MeSH Indexing)
Aldehydes/chemistry
Carboxylic Acids/chemistry
Cellulose/chemistry*
Cyclic N-Oxides/chemistry*
Molecular Weight
Oxidation-Reduction

Find related publications in this database (Keywords)
TEMPO-mediated oxidation
Lyocell fibers
Gel permeation chromatography (GPC)
Molecular weight distribution (MWD)
Fluorescence labeling
Functional group profiles


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