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Zahra, Hilda; Sawada, Daisuke; Guizani, Chamseddine; Ma, Yibo; Kumagai, Shogo; Yoshioka, Toshiaki; Sixta, Herbert; Hummel, Michael
Biomacromolecules, 10/2020, Volume: 21, Issue: 10Journal Article
A low carbon yield is a major limitation for the use of cellulose-based filaments as carbon fiber precursors. The present study aims to investigate the use of an abundant biopolymer chitosan as a natural charring agent particularly on enhancing the carbon yield of the cellulose-derived carbon fiber. The ionic liquid 1,5-diazabicyclo4.3.0non-5-enium acetate (DBNHOAc) was used for direct dissolution of cellulose and chitosan and to spin cellulose-chitosan composite fibers through a dry-jet wet spinning process (Ioncell). The homogenous distribution and tight packing of cellulose and chitosan revealed by X-ray scattering experiments enable a synergistic interaction between the two polymers during the pyrolysis reaction, resulting in a substantial increase of the carbon yield and preservation of mechanical properties of cellulose fiber compared to other cobiopolymers such as lignin and xylan.
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