Browsing by Subject "Ioncell-F"

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  • Asaadi, Shirin; Kakko, Tia; King, Alistair W. T.; Kilpeläinen, Ilkka; Hummel, Michael; Sixta, Herbert (2018)
    Cellulose acetate is one of the most important cellulose derivatives. Herein we present a method to access cellulose acetate with a low degree of substitution through a homogeneous reaction in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]). This ionic liquid has also been identified as an excellent cellulose solvent for dry-jet wet fiber spinning. Cellulose was dissolved in [DBNH] [OAc] and esterified in situ to be immediately spun into modified cellulose filaments with a degree of substitution (DS) value of 0.05-0.75. The structural properties of the resulting fibers, which are characterized by particularly high tensile strength values (525-750 MPa conditioned and 315-615 MPa wet) and elastic moduli between 10-26 GPa, were investigated by birefringence measurements, wide-angle X-ray scattering, and molar mass distribution techniques while their unique interactions with water have been studied through dynamic vapor sorption. Thus, an understanding of the novel process is gained, and the advantages are demonstrated for producing high-value products such as textiles, biocomposites, filters, and membranes.
  • Fager, Silja (Helsingin yliopisto, 2019)
    In this study the staining of cellulose fibers with mordant dyeing and disperse dyeing techniques are investigated. Previous studies have shown disperse dyeing gives better staining results than mordant dyeing when using synthetic fibers with natural colorants. This study explores the suitability of the disperse dyeing method for cellulose fibers. The study focuses on four cellulosic fibers: viscose, bamboo viscose, lyocell and Ioncell-F. The reference fiber for testing is merino wool. All samples are knitted. There is a little research on disperse-dyed cellulosic fiber with natural colorants, but no previous research with Ioncell-F fiber at all. Disperse dyeing was tested with and without tannin mordant. Mordant-dyed samples are for comparison. Flavonoid-containing onion skins Allium cepa and anthraquinone-containing fungus Cortinarius semisanguineus were used as sources of dyes. The pH for the dye liquor was adjusted to 8 with sodium hydroxide, except for the dyebath for the merino wool that is poorly resistant to bases. Merinos dye liquor adjusted with hydrochloric acid to pH 4. Different dyeing techniques were used with the same dyebath, except for the extra batch of celluose fibres, for which a separate dyebath was prepared from the onion skins and the pH of the dyebath was kept acidic. The color values of the dyed samples were measured on a spectrophotometer, whereby the dyeing results could be viewed as L*, a* and b* values according to CIELAB. In addition, the color fastness to light and washing were tested according to the ISO standards. The dyeing results of the cellulose fibres were lower than merino wool reference in all dyeing techniques. Ioncell-F fiber dyed very similarly to the other cellulosic fibers. Onion skins gave a darker and more stable color compared to the fungus whose color was light throughout the samples and the color fastness in light and washing tests were low. According to the results of this study Cortinarius semisanguineus is poorly suited for dyeing cellulose fibers. It is preferred to dye with the onion skins with the natural pH of the dyebath, under acidic conditions by the dispersion dyeing technique. In this case, the results of the dyeing are better and more stable even without the mordant.
  • Sirviö, Eeva-Kaisa (Helsingfors universitet, 2017)
    Objectives. In this qualitative study we study of the Finnish 2010s textile fibre innovations. We are especially interested in the more sustainable approaches of these innovations, compared to the conventional processes in the textile industry. We aim to find answers to the following questions: What kind of new textile fibre innovations have been developed in Finland during 2010s? and In what way the new innovations are more sustainable than the conventional processes in the textile industry? Methods. The background information about the new Finnish textile fibre innovations were collected from the internet and the news. The new Finnish innovations are Pure Waste, Biocelsol, Ioncell-F and Spinnova. The research material was collected by interviews: I interviewed persons who are responsible for the innovations. This research was performed as a case study. The data was analyzed with the qualitative content analysis, and themed with combination of the theory and the data. Results and conclusions. With the qualitative content analysis four themes were found from the data. These were innovation, raw material, manufacturing and future. We find that the new Finnish textile fibre innovations are a more sustainable option, compared to the conventional textile fibres. Essential themes were reducing chemicals, arable land use and water.