As the first industrially produced green fiber, Lyocell has attracted significant attention. However, the high viscosity of cellulose/N-methylmorpholine N-oxide (NMMO) solution during production constitutes a significant challenge to large-scale manufacturing. To enhance the processability of cellulose solutions and facilitate the development of high-strength fibers, this study synthesized a novel mesogenic unit, N-methyl-N-(alkyloxy-(4’-cyanobiphenyl)) morpholinium bromide (CNMMBr), based on molecular design principles. The mesogenic unit was dissolved in a composite solvent system consisting of N-Methylmorpholine N-Oxide monohydrate (NMMO·H₂O) and dimethyl sulfoxide (DMSO). POM testing shows that a liquid crystalline phase emerged when the CNMMBr content was 0.5–1 wt% and the solution temperature ranged from 70 to 90 ℃. Composite fibers were fabricated using the dry-jet wet spinning technique. The resulting fibers exhibited a 4% improvement in breaking strength relative to those produced using pure NMMO·H₂O. Furthermore, the incorporation of 1 wt% CNMMBr led to a 40% enhancement in breaking strength compared to fibers produced using the pure solvent system. These results demonstrate that in the NMMO·H₂O/DMSO system, the orientational induction effect by the mesogenic unit significantly facilitates the ordered alignment of cellulose chains, thereby providing both a theoretical foundation and a practical strategy for the development of next-generation high-strength bio-based fibers.
Jia et al. (Sun,) studied this question.
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