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Solubility and spinnability of cellulose-lignin blends in specific ionic liquids

Löslichkeit und Spinnbarkeit von Cellulose-Lignin-Mischungen in spezifischen ionischen Flüssigkeiten
: Protz, Robert; Lehmann, André; Bohrisch, Jörg; Ganster, Johannes; Fink, Hans-Peter

Volltext urn:nbn:de:0011-n-6220551 (2.3 MByte PDF)
MD5 Fingerprint: 359319b2794ea80fd5ac0e2d39184d76
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Erstellt am: 5.2.2021

Carbohydrate Polymer Technologies and Applications (2021), Online First, Art. 100041, 23 S.
ISSN: 2666-8939
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IAP ()
bicomponent cellulose-lignin fibers; straw-based regenerated fibers; ionic liquids; phase diagram; fiber morphology

The direct dissolution and joint spinning of cellulose and lignin in BmimChc and EmimAc were investigated by using blends of dissolving pulp and kraft lignin as a model for subsequent processing real lignocellulosics wood-TMP and wheat straw. The solubility of cellulose and lignin in the solvents is represented by ternary phase diagrams. The limits of solubility for different cellulose/lignin ratios were found to be an approximately linear function of the lignin content. Air-gap spinning was realized for the model compound with up to 50 % lignin loading with both ionic liquids, whereas TMP and wheat straw could be processed acceptably only with BmimChc. The resulting bicomponent model fibers exhibit a rather high level of tenacity (33 to 46 cN/tex) and modulus (1500 to 2000 cN/tex). The cellulose fraction is dominating the fiber morphology while the lignin is incorporated in the core and somewhat leached out from the shell region.