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  • Structural and sorption characteristics of pre-treated cellulose fibers
    Peršin Fratnik, Zdenka ; Stana-Kleinschek, Karin ; Sfiligoj-Smole, Majda
    Viscose, modal and lyocell fibres possess similar chemical, yet different supra-molecular structure, due to the use of different manufacturing processes. Standard chemical pre-treatment processes ... additionally cause changes in fibres' structures, resulting in different sorption properties. The research was carried out on viscose, modal, and lyocell fibres, which were pre-treated using different processes (alkaline washing, bleaching, and slack-mercerisation). The purpose of the research was to determine any changesin the structural and sorption properties, due to the use of different pre-treatment processes. Changes in the supramolecular fibres' structures were done using x-ray analysis, and the void system was investigated as a function of different pre-treatment procedures using size-exclusion chromatography. The differences in the structural properties, as reflected in the different reactive groups' accessibilities, were determined as the carboxyl groups' contents appreciated, using the Methylene blue method. The sorption properties, due to the use of different pre-treatments, were monitored as diffusion properties using reagents of different molecular size. When using the pre-treatments, the crystallinity degree increased which coincides with the ISV results, but the void system remained unchanged. The reactive groups (-COOH) correlated with the crystallinity but did not have any influence on the sorption fibres' properties. After the pre-treatment was done, despite a higher degree of crystallinity and the small amount of the carboxyl group, the fibres became more hydrophilic and were able to sorb both big and small reagents' molecules (water, direct dye). This phenomenon can be explained by changes in the accessible reactive groups' surfaces within the modified morphological fibres' structure.
    Vir: IN-TECH 2010 : proceedings (Str. 284-285)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 14414102

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