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  • 1.
    Bågenholm-Ruuth, Edvin
    et al.
    Lund university, Sweden.
    Sanchis-Sebastiá, Miguel
    ShareTex AB, Sweden.
    Hollinger, Nadine
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi.
    Teleman, Anita
    RISE Research Institutes of Sweden.
    Larsson, Per Tomas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Wallberg, Ola
    Lund university, Sweden.
    Transforming post-consumer cotton waste textiles into viscose staple fiber using hydrated zinc chloride2024Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 31, nr 2, s. 737-748Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Large amounts of cellulose-based waste textiles are generated every year, yet little is done to recycle this waste. Alternatives such as fiber-to-fiber recycling, where a significant part of the value of the waste textiles is recovered, are attractive possibilities. In this study, we have investigated the viability of using hydrated zinc chloride (ZnCl2·4H2O) as a solvent and swelling agent to convert cotton waste textiles (the most abundant cellulose-based waste textile) into a dissolving pulp that can be used as raw material for the production and spinning of viscose fibers. The solvent produced an accessible dissolving pulp and exhibited excellent recyclability, maintaining good dissolving power even after repeated recycling. The dissolving pulp was subsequently used to produce viscose dope, a spinning solution which was spun and cut into viscose staple fibers. The viscose dope exhibited good properties (moderate filter clogging value and gamma number), and the resulting staple fibers were strong and of good quality (high linear density, elongation, and tenacity). These results illustrate the potential of using hydrated zinc chloride for the production of viscose grade dissolving pulp from cotton waste textiles. 

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  • 2.
    Gidlöf, Zandra
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel. Lund University, Sweden.
    Lomstein Pedersen, Betty
    Ferring Pharmaceuticals A/S, SWeden.
    Nilsson, Lars
    Lund University, Sweden.
    Teleman, Anita
    RISE Research Institutes of Sweden.
    Wahlgren, Marie
    Lund University, Sweden.
    Millqvist-Fureby, Anna
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.
    Utilising phase diagram to understand barley starch microsphere preparation in an aqueous two-phase system2023Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 658, artikel-id 130652Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this work, a waxy barley starch-PEG aqueous two-phase system (ATPS) phase diagram was constructed, and starch microsphere preparation was explored at different phase diagram positions. The aim was to investigate starch-PEG ATPS phase behaviour and relate this to starch crystallisation and microsphere formation. The hypothesis was that phase diagram position would influence the starch microsphere preparation and the properties of the microspheres. The microsphere formation process was investigated with regard to microsphere development and starch crystallisation kinetics. Microsphere physicochemical properties and their development during different stages of the preparation were studied by examining freshly produced, freeze-dried, and redispersed microspheres. Enzymatic hydrolysis of redispersed microspheres was also investigated. It was possible to produce microspheres from different positions in the phase diagram using 24 h incubation at 25 °C. However, the operational area for the used production conditions was relatively small compared to the biphasic region of the phase diagram. The main findings were that the starch-PEG ATPS phase behaviour can affect the rate of microsphere formation and particle size, but the additional properties of the dried and redispersed microspheres did not differ to a considerable extent. Thus, we have identified a robust production space where production parameters such as time to obtain microspheres can be considerably influenced by the ATPS system phase diagram position.

  • 3.
    Nechyporchuk, Oleksandr
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Kemi, biomaterial och textil.
    Hanna, Ulmefors
    RISE Research Institutes of Sweden, Material och produktion, Kemi, biomaterial och textil.
    Teleman, Anita
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Silica-rich regenerated cellulose fibers enabled by delayed dissolution of silica nanoparticles in strong alkali using zinc oxide2021Ingår i: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 264, artikel-id 118032Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Silica nanoparticles (SNPs) dissolve in alkaline media, which limits their use in certain applications. Here, we report a delayed dissolution of SNPs in strong alkali induced by zinc oxide (ZnO), an additive which also limits gelation of alkaline cellulose solutions. This allows incorporating high solid content of silica (30 wt%) in cellulose solutions with retention of their predominant viscous behavior long enough (ca. 180 min) to enable fiber wet spinning. We show that without addition of ZnO, silica dissolves completely, resulting in strong gelation of cellulose solutions that become unsuitable for wet spinning. With an increase of silica concentration, gelation of the solutions occurs faster. Employing ZnO, silica-rich regenerated cellulose fibers were successfully spun, possessing uniform cross sections and smooth surface structure without defects. These findings are useful in advancing the development of functional man-made cellulose fibers with incorporated silica, e.g., fibers with flame retardant or self-cleaning properties. © 2021 The Author(s)

  • 4.
    Nissilä, Tuukka
    et al.
    University of Oulu, Finland.
    Wei, Jiayuan
    Luleå University of Technology, Sweden.
    Geng, Shiyu
    Luleå University of Technology, Sweden.
    Teleman, Anita
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Oksman, Kristiina
    Luleå University of Technology, Sweden;University of Toronto, Canada.
    Ice-templated cellulose nanofiber filaments as a reinforcement material in epoxy composites2021Ingår i: Nanomaterials, E-ISSN 2079-4991, Vol. 11, nr 2, artikel-id 490Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Finding renewable alternatives to the commonly used reinforcement materials in composites is attracting a significant amount of research interest. Nanocellulose is a promising candidate owing to its wide availability and favorable properties such as high Young’s modulus. This study addressed the major problems inherent to cellulose nanocomposites, namely, controlling the fiber structure and obtaining a sufficient interfacial adhesion between nanocellulose and a non-hydrophilic matrix. Unidirectionally aligned cellulose nanofiber filament mats were obtained via ice-templating, and chemical vapor deposition was used to cover the filament surfaces with an aminosilane before impregnating the mats with a bio-epoxy resin. The process resulted in cellulose nanocomposites with an oriented structure and a strong fiber–matrix interface. Diffuse reflectance infrared Fourier transform and X-ray photoelectron spectroscopy studies revealed the presence of silane on the filaments. The improved interface, resulting from the surface treatment, was observable in electron microscopy images and was further confirmed by the significant increase in the tan delta peak temperature. The storage modulus of the matrix could be improved up to 2.5-fold with 18 wt% filament content and was significantly higher in the filament direction. Wide-angle X-ray scattering was used to study the orientation of cellulose nanofibers in the filament mats and the composites, and the corresponding orientation indices were 0.6 and 0.53, respectively, indicating a significant level of alignment. © 2021 by the authors.

  • 5.
    Nordström, Maria
    et al.
    STFI.
    Teleman, Anita
    STFI.
    Jacobs, Anna
    STFI.
    Dahlman, Olof
    STFI.
    Characterization of acetylated glucomannans from Aspen and Birch2002Ingår i: Towards molecular-level understanding of wood, pulp and paper: Seventh European workshop on lignocellulosics and pulp (EWLP 2002), 2002, s. 39-42Konferensbidrag (Refereegranskat)
    Abstract [en]

    O-acetylated glucomannans were isolated from aspen and birch wood. The isolation procedure involved a sequential extraction of acetone-extracted wood meal with DMSO and hot water, after which the glucomannan was purified using size-exclusion chromatography (SEC). The isolated glucomannans were characterized using capillary zone electrophoresis (CZE), SEC/MALDI-MS and NMR spectroscopy.

  • 6.
    Pjanic, P.
    et al.
    Ecole Polytechnique Federale de Lausanne, Switzerland.
    Yang, Li
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Teleman, Anita
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Hersch, R. D.
    Ecole Polytechnique Federale de Lausanne, Switzerland.
    Angular Color Prediction Model for Anisotropic Halftone Prints on a Metallic Substrate2019Ingår i: Journal of Imaging Science and Technology, ISSN 1062-3701, E-ISSN 1943-3522, Vol. 63, nr 4, s. 040407-1-040407-11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Under specular reflection, non-isotropic halftones such as line halftones printed on an ink-receiving plastic layer superposed with a metallic layer change their colors upon in-plane rotation of the print. This color change is due to the orientation-dependent optical dot gain of the halftone. A strong dot gain occurs when the incident light is perpendicular to the halftone line structure. A color prediction model is proposed which predicts under specular reflection the color of cyan, magenta and yellow line halftones as a function of the azimuthal rotation angle, the incident angle and the line frequency. The model is calibrated by measuring 17 reflectances at the (25 : 25) measurement geometry, with the incident light parallel to the halftone lines. The model has been tested for several azimuthal rotation and incident viewing angles, each time for 125 different cyan, magenta and yellow ink surface coverages.

  • 7.
    Ruuth, Edvin
    et al.
    Lund University, Sweden.
    Sanchis-Sebastiá, Miguel
    ShareTex AB, Sweden.
    Larsson, Per Tomas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa.
    Teleman, Anita
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Jiménez-Quero, Amparo
    KTH Royal Institute of Technology, Sweden.
    Delestig, Sara
    KTH Royal Institute of Technology, Sweden.
    Sahlberg, Viktor
    KTH Royal Institute of Technology, Sweden.
    Salén, Patricia
    KTH Royal Institute of Technology, Sweden.
    Sanchez Ortiz, Marjorie
    KTH Royal Institute of Technology, Sweden.
    Vadher, Simjan
    KTH Royal Institute of Technology, Sweden.
    Wallberg, Ola
    Lund University, Sweden.
    Reclaiming the Value of Cotton Waste Textiles: A New Improved Method to Recycle Cotton Waste Textiles via Acid Hydrolysis2022Ingår i: Recycling, E-ISSN 2313-4321, Vol. 7, nr 4, artikel-id 57Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The fashion industry is becoming one of the largest emitters worldwide due to its high consumption of raw materials, its effluents, and the fact that every garment will eventually contribute to the vast amount of waste being incinerated or accumulating in landfills. Although fiber-to-fiber recycling processes are being developed, the mechanical properties of the textile fibers are typically degraded with each such recycle. Thus, tertiary recycling alternatives where textiles are depolymerized to convert them into valuable products are needed to provide end-of-life alternatives and to achieve circularity in the fashion industry. We have developed a method whereby cotton waste textiles are depolymerized to form a glucose solution, using sulfuric acid as the sole catalyst, with a high yield (>70%). The glucose solution produced in this process has a high concentration (>100 g/L), which reduces the purification cost and makes the process industrially relevant. This method can be applied regardless of the quality of the fibers and could therefore process other cellulosic fibers such as viscose. The glucose produced could subsequently be fermented into butanediol or caprolactam, precursors for the production of synthetic textile fibers, thus retaining the value of the waste textiles within the textile value chain. © 2022 by the authors.

  • 8.
    Singh, Shikha
    et al.
    Luleå University of Technology, Sweden; Universitat Politècnica de Catalunya Barcelona Tech, Spain.
    Patel, Mitul
    Luleå University of Technology, Sweden.
    Geng, Shiyu
    Luleå University of Technology, Sweden.
    Teleman, Anita
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Herrera, Natalia
    Luleå University of Technology, Sweden.
    Schwendemann, Daniel
    Luleå University of Technology, Sweden; OST Eastern Switzerland University of Applied Sciences, Switzerland.
    Maspoch, Maria
    Universitat Politècnica de Catalunya Barcelona Tech, Spain.
    Oksman, Kristina
    Luleå University of Technology, Sweden;University of Toronto, Canada.
    Orientation of polylactic acid–chitin nanocomposite films via combined calendering and uniaxial drawing: Effect on structure, mechanical, and thermal properties2021Ingår i: Nanomaterials, E-ISSN 2079-4991, Vol. 11, nr 12, artikel-id 3308Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The orientation of polymer composites is one way to increase the mechanical properties of the material in a desired direction. In this study, the aim was to orient chitin nanocrystal (ChNC)-reinforced poly(lactic acid) (PLA) nanocomposites by combining two techniques: calendering and solid-state drawing. The effect of orientation on thermal properties, crystallinity, degree of orientation, mechanical properties and microstructure was studied. The orientation affected the thermal and structural behavior of the nanocomposites. The degree of crystallinity increased from 8% for the isotropic compression-molded films to 53% for the nanocomposites drawn with the highest draw ratio. The wide-angle X-ray scattering results confirmed an orientation factor of 0.9 for the solid-state drawn nanocomposites. The mechanical properties of the oriented nanocomposite films were significantly improved by the orientation, and the pre-orientation achieved by film calendering showed very positive effects on solid-state drawn nanocomposites: The highest mechanical properties were achieved for pre-oriented nanocomposites. The stiffness increased from 2.3 to 4 GPa, the strength from 37 to 170 MPa, the elongation at break from 3 to 75%, and the work of fracture from 1 to 96 MJ/m3. This study demonstrates that the pre-orientation has positive effect on the orientation of the nanocomposites structure and that it is an extremely efficient means to produce films with high strength and toughness. © 2021 by the authors. 

  • 9.
    Stålbrand, Henrik
    et al.
    Lund university, Sweden.
    Lundqvist, Jon
    Lund university, Sweden.
    Andersson, Alexandra
    Lund university, Sweden.
    Hägglund, Per
    Lund university, Sweden.
    Anderson, Lars
    Lund university, Sweden.
    Tjerneld, Folke
    Lund university, Sweden.
    Jacobs, Anna
    STFI.
    Teleman, Anita
    STFI.
    Dahlman, Olof
    STFI.
    Palm, M.
    Lund university, Sweden.
    Zacchi, G.
    Lund university, Sweden.
    Isolation, Characterization, and Enzymatic Hydrolysis of Acetyl-Galactoglucomannan from Spruce (Picea abies)2004Ingår i: Hemicelluloses: Science and Technology, American Chemical Society (ACS), 2004, chapter 5, s. 66-78Kapitel i bok, del av antologi (Refereegranskat)
  • 10.
    Teleman, Anita
    et al.
    STFI.
    Nordström, Maria
    STFI.
    Tenkanen, Maija
    VTT, Finland.
    Jacobs, Anna
    STFI.
    Dahlman, Olof
    STFI.
    Isolation and characterization of O-acetylated glucomannans from aspen and birch wood2003Ingår i: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 338, nr 6, s. 525-534Artikel i tidskrift (Refereegranskat)
  • 11.
    Teleman, Anita
    et al.
    STFI.
    Tenkanen, Maija
    VTT, Finland.
    Jacobs, Anna
    STFI.
    Dahlman, Olof
    STFI.
    Characterization of O-acetyl-(4-O-methylglucurono)xylan isolated from birch and beech2002Ingår i: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 337, nr 4, s. 373-377Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The structures of water-soluble birch and beech xylans, extracted from holocellulose using dimethyl sulfoxide, were determined employing 1H and 13C NMR spectroscopy together with chemical analysis. These polysaccharides were found to be O-acetyl-(4-O-methylglucurono)xylans containing one 4-O-methylglucuronic acid substituent for approximately every 15 D-xylose residues. The average degree of acetylation of the xylose residues in these polymers was 0.4. The presence of the structural element → 4)[4-O-Me-α-D-GlcpA-(1 → 2)][3-O-Ac]-β-D-Xylp-(1 → was demonstrated. Additional acetyl groups were present as substituents at C-2 and/or C-3 of the xylopyranosyl residues. Utilizing size-exclusion chromatography in combination with mass spectroscopy, the weight-average molar masses (and polydispersities) were shown to be 8000 (1.09) and 11,100 (1.08) for birch and beech xylan, respectively.

  • 12.
    Völtz, Luísa Rosenstock
    et al.
    Luleå University of Technology, Sweden.
    Geng, Shiyu
    Luleå University of Technology, Sweden.
    Teleman, Anita
    RISE Research Institutes of Sweden.
    Oksman, Kristiina
    Luleå University of Technology, Sweden; University of Toronto, Canada.
    Influence of Dispersion and Orientation on Polyamide-6 Cellulose Nanocomposites Manufactured through Liquid-Assisted Extrusion2022Ingår i: Nanomaterials, E-ISSN 2079-4991, Vol. 12, nr 5, artikel-id 818Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, the possibility of adding nanocellulose and its dispersion to polyamide 6 (PA6), a polymer with a high melting temperature, is investigated using melt extrusion. The main challenges of the extrusion of these materials are achieving a homogeneous dispersion and avoiding the thermal degradation of nanocellulose. These challenges are overcome by using an aqueous suspension of never-dried nanocellulose, which is pumped into the molten polymer without any chemical modification or drying. Furthermore, polyethylene glycol is tested as a dispersant for nanocellulose. The dispersion, thermal degradation, and mechanical and viscoelastic properties of the nanocomposites are studied. The results show that the dispersant has a positive impact on the dispersion of nanocellulose and that the liquid-assisted melt compounding does not cause the degradation of nanocellulose. The addition of only 0.5 wt.% nanocellulose increases the stiffness of the neat polyamide 6 from 2 to 2.3 GPa and shifts the tan δ peak toward higher temperatures, indicating an interaction between PA6 and nanocellulose. The addition of the dispersant decreases the strength and modulus but has a significant effect on the elongation and toughness. To further enhance the mechanical properties of the nanocomposites, solid-state drawing is used to create an oriented structure in the polymer and nanocomposites. The orientation greatly improves its mechanical properties, and the oriented nanocomposite with polyethylene glycol as dispersant exhibits the best alignment and properties: with orientation, the strength increases from 52 to 221 MPa, modulus from 1.4 to 2.8 GPa, and toughness 30 to 33 MJ m<sup>-3</sup> in a draw ratio of 2.5. This study shows that nanocellulose can be added to PA6 by liquid-assisted extrusion with good dispersion and without degradation and that the orientation of the structure is a highly-effective method for producing thermoplastic nanocomposites with excellent mechanical properties.

  • 13.
    Yang, Li
    et al.
    RISE., Innventia.
    Thorman, Sofia
    RISE., Innventia.
    Teleman, Anita
    RISE., Innventia.
    Flexographic printability of packaging: challenges and new approaches2014Konferensbidrag (Refereegranskat)
  • 14.
    Yang, Li
    et al.
    RISE., Innventia.
    Thorman, Sofia
    RISE., Innventia.
    Teleman, Anita
    RISE., Innventia.
    Study on flexpgraphic printability of packaging2014Ingår i: China Printing and Packaging Study, ISSN 1674-5752, Vol. 6, nr 6, s. 1-3Artikel i tidskrift (Övrigt vetenskapligt)
1 - 14 av 14
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