Stability of TEMPO-oxidized cotton fibers during natural aging

Jovana Milanovic; Sonja Schiehser; Antje Potthast; Mirjana Kostic

doi:10.1016/j.carbpol.2019.115587

Stability of TEMPO-oxidized cotton fibers during natural aging

Carbohydr Polym. 2020 Feb 15:230:115587. doi: 10.1016/j.carbpol.2019.115587. Epub 2019 Nov 8.

Authors

Jovana Milanovic¹, Sonja Schiehser², Antje Potthast³, Mirjana Kostic⁴

Affiliations

¹ Innovation Center of the Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia. Electronic address: jovana@tmf.bg.ac.rs.
² Institute of Chemistry of Renewable Resources, Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria. Electronic address: sonja.schiehser@boku.ac.at.
³ Institute of Chemistry of Renewable Resources, Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria. Electronic address: antje.potthast@boku.ac.at.
⁴ Department of Textile Engineering, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia. Electronic address: kostic@tmf.bg.ac.rs.

PMID: 31887889
DOI: 10.1016/j.carbpol.2019.115587

Abstract

Stability of cotton fibers oxidized by the 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO)-mediated system during natural aging was monitored; the oxidized and five-year-aged fibers were characterized in terms of molecular weight distribution, quantity and distribution of functionalities, tensile strength, color difference, and yellowness index. The distribution of functionalities introduced in cotton fibers by TEMPO-mediated oxidation and subsequent aging was investigated by means of gel permeation chromatography using multiple detection and group-selective labeling. The mild TEMPO-mediated oxidation retains the molar mass of oxidized cotton, but this status is not stable during natural aging. For highly oxidized cotton, the molar mass of aged fibers is low but stable. Aged TEMPO-oxidized cotton shows a prominent discoloration and an increased yellowness index. For tensile strength, the limiting value was obtained for aged TEMPO-oxidized cotton, regardless of whether the samples had initially been oxidized with a low or high degree of oxidation.

Keywords: Aging; Functional group contents and profiles; Molecular weight distribution; TEMPO-oxidized cotton; Tensile strength; Yellowing.

MeSH terms

Cellulose / chemistry*
Cotton Fiber / analysis*
Cyclic N-Oxides / chemistry
Cyclic N-Oxides / pharmacology
Molecular Weight
Nanofibers / chemistry*
Oxidation-Reduction / drug effects
Tensile Strength

Substances

Cyclic N-Oxides
Cellulose
TEMPO