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.
Keywords:
TEMPO-mediated oxidation / Lyocell fibers / Gel permeation chromatography (GPC) / Molecular weight distribution (MWD) / Fluorescence labeling / Functional group profiles
TY - JOUR
AU - Milanović, Jovana
AU - Schiehser, Sonja
AU - Milanović, Predrag
AU - Potthast, Antje
AU - Kostić, Mirjana
PY - 2013
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2428
AB - 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.
PB - Elsevier Sci Ltd, Oxford
T2 - Carbohydrate Polymers
T1 - Molecular weight distribution and functional group profiles of TEMPO-oxidized lyocell fibers
EP - 450
IS - 1
SP - 444
VL - 98
DO - 10.1016/j.carbpol.2013.06.033
ER -
@article{
author = "Milanović, Jovana and Schiehser, Sonja and Milanović, Predrag and Potthast, Antje and Kostić, Mirjana",
year = "2013",
abstract = "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.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Molecular weight distribution and functional group profiles of TEMPO-oxidized lyocell fibers",
pages = "450-444",
number = "1",
volume = "98",
doi = "10.1016/j.carbpol.2013.06.033"
}
Milanović, J., Schiehser, S., Milanović, P., Potthast, A.,& Kostić, M.. (2013). Molecular weight distribution and functional group profiles of TEMPO-oxidized lyocell fibers. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 98(1), 444-450.
https://doi.org/10.1016/j.carbpol.2013.06.033
Milanović J, Schiehser S, Milanović P, Potthast A, Kostić M. Molecular weight distribution and functional group profiles of TEMPO-oxidized lyocell fibers. in Carbohydrate Polymers. 2013;98(1):444-450.
doi:10.1016/j.carbpol.2013.06.033 .
Milanović, Jovana, Schiehser, Sonja, Milanović, Predrag, Potthast, Antje, Kostić, Mirjana, "Molecular weight distribution and functional group profiles of TEMPO-oxidized lyocell fibers" in Carbohydrate Polymers, 98, no. 1 (2013):444-450,
https://doi.org/10.1016/j.carbpol.2013.06.033 . .
