Solubility and spinnability of cellulose-lignin blends in aqueous NMMO
| Autor: | Hans-Peter Fink, R. Protz, André Lehmann, Johannes Ganster |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2020 |
| Předmět: |
Aqueous solution
Polymers and Plastics Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences phase diagram fiber morphology 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Lignin Fiber Cellulose Solubility bicomponent cellulose-lignin fibers NMMO 0210 nano-technology Dissolving pulp Spinning Dissolution |
| Zdroj: | Carbohydrate polymers. 251 |
| ISSN: | 1879-1344 |
| Popis: | The direct dissolution and joint spinning of cellulose and lignin from NMMO-water were investigated by using dissolving pulp and purified KRAFT lignin. Compared to the rather narrow dissolution window of cellulose in the NMMO-water system, lignin with concentrations up to 15 wt.-% was shown to dissolve in a range from 30 % NMMO to 70 % NMMO at room temperature. The quasi-ternary phase diagram of cellulose-lignin-(NMMO-monohydrate) is represented by a cross section at 95 °C. Dry-jet wet spinning was realized for the cellulose-lignin compound up to 50 % lignin loading. The spinnability decreases with increasing lignin content. SEM and TEM investigations of the fibers exhibit a core-shell structure with a dense core and a porous shell with lower lignin content. In accordance with the X-ray fiber diagrams, it can be concluded that cellulose governs fiber formation and fiber properties while lignin acts mainly as a filler in the core region. |
| Databáze: | OpenAIRE |
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