Rozdziały

Stały URI dla kolekcjihttp://hdl.handle.net/11652/4411

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Filtry

20222

Ustawienia

Autorsearch.filters.applied.operator.equals: search.filters.author.Čorak, IvanaMa przypisane plikisearch.filters.applied.operator.equals: Tak

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Teraz wyświetlane 1 - 2 z 2
  • Pozycja
    Accelerated hydrolysis of PLA fibers at low temperature
    (Wydawnictwo Politechniki Łódzkiej, 2022) Tarbuk, Anita; Čorak, Ivana; Đorđević, Dragan; Draczyński, Zbigniew
    The polylactide (PLA) is the most common biodegradable material. However, its biodegradation requires hydrolysis of PLA to oligomers or monomers before microbes can act. Hydrolytic degradation of PLA depends on temperature, time and relative humidity. It takes months and years until complete biodegradation. If a catalyst is introduced, i.e. alkali or alcohol, it can be done in weeks. In this article, the alkaline hydrolysis was performed at low temperatures 40-60°C without and with the addition of cationic compound as an accelerator for the purpose of saving energy and time for complete PLA degradation. It has been shown that complete degradation can be achieved in only 10 min at 40°C.
  • Pozycja
    The cationization of cotton/polyester blend
    (Wydawnictwo Politechniki Łódzkiej, 2022) Čorak, Ivana; Tarbuk, Anita; Dekanić, Tihana; Brnada, Snježana; Domljan, Lucija
    Cotton cellulose can be cationized with amines and quaternary ammonium compounds in alkaline medium to change fiber surface charge. Such modified cotton adsorbs anionic dyes and auxiliaries due to attractive forces between fiber and compound. Due to crystallinity of polyester fiber, its adsorption is low. Polyester is usually modified by alkaline hydrolysis with cationic compounds as accelerators. For all these reasons, in this paper, the cationization of cotton/polyester blended fabrics was performed. The change of fabric was studied through interface phenomena – zeta potential, moisture management and adsorption of anionic optical brightener. Zeta potential confirmed that the surface charge has been changed. Cationization led to better adsorption of optical brightener and higher capillarity of fabrics.