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Pregled bibliografske jedinice broj: 967428

Influence of Different Oxidizing Systems on Cellulose Oxidation Level : Introduced Groups vs Degradation Model


(Faculty of Technology and Metallurgy, Department of Textiles, University Ss. Cyril and Methodius, Republic of Macedonia, Skopje) Toshikj, Emilija; Tarbuk, Anita; Grgić, Katia; Mangovska, Biljana; Jordanov, Igor
Influence of Different Oxidizing Systems on Cellulose Oxidation Level : Introduced Groups vs Degradation Model // Cellulose, 26 (2019), 2; 777-794 doi:10.1007/s10570-018-2133-4 (međunarodna recenzija, članak, znanstveni)


Naslov
Influence of Different Oxidizing Systems on Cellulose Oxidation Level : Introduced Groups vs Degradation Model

Autori
Toshikj, Emilija ; Tarbuk, Anita ; Grgić, Katia ; Mangovska, Biljana ; Jordanov, Igor

Kolaboracija
Faculty of Technology and Metallurgy, Department of Textiles, University Ss. Cyril and Methodius, Republic of Macedonia, Skopje

Izvornik
Cellulose (0969-0239) 26 (2019), 2; 777-794

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Cotton ; oxidation ; aldehyde groups ; carboxyl groups ; degradation

Sažetak
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.

Izvorni jezik
Engleski



POVEZANOST RADA


Ustanove
Tekstilno-tehnološki fakultet, Zagreb

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  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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