Filament spinning of unbleached birch kraft pulps Effect of pulping intensity on the processability and the fiber properties
| Autor: | Michael Hummel, Jonas Stubb, Herbert Sixta, Yibo Ma, Kaarlo Nieminen, Inkeri Kontro |
|---|---|
| Přispěvatelé: | Department of Physics, Materials Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Polymers and Plastics
Spinning 116 Chemical sciences Lignocellulosic biomass REGENERATED CELLULOSE FIBERS PRETREATMENT 02 engineering and technology ENZYMATIC-HYDROLYSIS engineering.material Degree of polymerization Ionic liquid 010402 general chemistry CRYSTALLINE 114 Physical sciences 01 natural sciences LIGNOCELLULOSIC BIOMASS chemistry.chemical_compound Crystallinity stomatognathic system Materials Chemistry Lignin Composite material ta216 chemistry.chemical_classification Refining COMPOSITE FIBERS Chemistry Pulp (paper) Organic Chemistry technology industry and agriculture Polymer Fibres 021001 nanoscience & nanotechnology SORPTION/DESORPTION 0104 chemical sciences Kraft process engineering 0210 nano-technology Lignocellulose Kraft paper |
| Zdroj: | CARBOHYDRATE POLYMERS. 179:145-151 |
| ISSN: | 0144-8617 |
| Popis: | Man-made lignocellulosic fibres were successfully prepared from unbleached birch kraft pulps by using the Ioncell-F technology. Pulps with different lignin content were produced by tailored kraft pulping with varying intensity. The degree of polymerization of the pulps was adjusted by acid-catalyzed hydrolysis and electron beam treatment. All substrates were completely soluble in 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH] OAc) and the respective solutions were spinnable to yield fibres with good to excellent mechanical properties despite the use of only mildly refined wood pulp. The tensile properties decreased gradually as the lignin concentration in the fibres increased. Changes in the chemical composition also affected the structure and morphology of the fibres. Both the molecular orientation and the crystallinity decreased while the presence of lignin enhanced the water accessibility. The effects of the crystallite size and lignin content on monolayer water adsorption are discussed. |
| Databáze: | OpenAIRE |
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