Influence of different oxidizing systems on cellulose oxidation level: introduced groups versus degradation model

Scientific paper - Original scientific paper

• Author: Emilija Toshikj
• Author: Anita Tarbuk
• Author: Katia Grgić
• Author: Biljana Mangovska
• Author: Igor Jordanov
• Author's institution: University of Zagreb; Faculty of Textile Technology; (Department of Textile Chemistry and Ecology)
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Textile Technology; Textile Chemistry

Abstract (english)

Bleached cotton yarns were oxidized by
potassium periodate and TEMPO-mediated oxidation
systems, with different concentrations and treatment
time, to obtain aldehyde and carboxyl oxy-cellulose
with different oxidation levels. Oxidized celluloses
were further treated with sodium chlorite to convert
the created aldehyde to carboxyl groups. The oxidation
level was evaluated by assessing the amount of
introduced aldehyde and carboxyl groups, the changes
in surface morphology and incurred degradation.
Functional groups were determined by titration methods,
while surface morphology by FTIR-ATR and
SEM analyses. Degradation was analysed by determining
the mechanical properties, degree of polymerization,
alkali solubility and whiteness stability of the
cotton samples. It has been established that a properly
selected oxidation system, with appropriate working
conditions, can provide satisfactory results for achieving
low, medium and extensively oxidized celluloses,
with a defined degradation profile. For a short
treatment time, a higher oxidation level could be
achieved by potassium periodate and TEMPO-mediated
oxidation with sodium bromide, while by using
the bromide-free TEMPO system a longer time was
necessary to reach the same oxidation level. The type
and oxidation level of the obtained oxy-celluloses
influenced their mechanical properties, degree of
polymerization, alkaline and whiteness stability.
Low-level oxidized celluloses are suitable for producing
stable, long-lasting materials with high added
value, while extensively oxidized ones are more
appropriate for developing disposable products.

• Keywords (english): cotton; oxidation; aldehyde groups; carboxyl groups; degradation
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Unknown
• Publication version: Published version
• Journal title: Cellulose
• Numbering: vol. 26, pp. 777-794
• p-ISSN: 0969-0239
• e-ISSN: 1572-882X
• DOI: https://doi.org/10.1007/s10570-018-2133-4
• URN:NBN: urn:nbn:hr:201:912692
• Publication: 2018-11-12
• Type of resource: Text
• Access conditions: Open access
• Created on: 2020-10-05 08:56:47