Abstract
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 (1500–2000 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.
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