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<p>Concentrated cellulose solutions undergo solution-gel transition at low temperatures, which results in higher strength and modulus of fibers prepared in low-temperature coagulation bath. Based on this hypothesis, a series of regenerated cellulose fibers using methanol coagulation bath at different temperatures were prepared and compared with commonly used water coagulation bath. The results showed that the strength and modulus of all fibers spun in methanol coagulation baths were higher than those spun in water coagulation baths. The fibers prepared at − 60&#xa0;°C exhibited the highest strength and modulus of 426&#xa0;MPa and 31.74 GPa, respectively. In order to reveal the impact of the composition and temperature of the coagulation bath on the fibers, the solvent in/out-diffusion in the fibers during the coagulation was quantified. At temperatures as low as − 60&#xa0;°C, LiCl exhibited minimal diffusion. Furthermore, the diffusion of non-solvent methanol declined as temperature decreased. At last, the process was validated with high molecular weight straw cellulose. High-performance regenerated cellulose fibers with strength of 664&#xa0;MPa and modulus of 41.26 GPa were successfully prepared.</p>

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Dry-jet wet-spun cellulose fibers: coagulation bath effects and straw cellulose utilization

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Chen Wang,
  • Jiaojiao Li,
  • Bingyu Zhao,
  • Yuxiu Yu,
  • Yan Song,
  • Yaodong Liu

摘要

Concentrated cellulose solutions undergo solution-gel transition at low temperatures, which results in higher strength and modulus of fibers prepared in low-temperature coagulation bath. Based on this hypothesis, a series of regenerated cellulose fibers using methanol coagulation bath at different temperatures were prepared and compared with commonly used water coagulation bath. The results showed that the strength and modulus of all fibers spun in methanol coagulation baths were higher than those spun in water coagulation baths. The fibers prepared at − 60 °C exhibited the highest strength and modulus of 426 MPa and 31.74 GPa, respectively. In order to reveal the impact of the composition and temperature of the coagulation bath on the fibers, the solvent in/out-diffusion in the fibers during the coagulation was quantified. At temperatures as low as − 60 °C, LiCl exhibited minimal diffusion. Furthermore, the diffusion of non-solvent methanol declined as temperature decreased. At last, the process was validated with high molecular weight straw cellulose. High-performance regenerated cellulose fibers with strength of 664 MPa and modulus of 41.26 GPa were successfully prepared.