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<p>To enhance the processability of cellulose ionic liquid solutions, a novel small molecule liquid crystal compound 4-(ω-(methyimidazole) hexyloxy) -4’-cyano-azobenzene (CaB) was designed and synthesized using 1,6-dibromohexane, 4-cyanoazophenol, and N-methylimidazole as the main raw materials. It was then added to a cellulose/ 1-Allyl-3-methylimidazole chloride (AMIMCl) solution to form a liquid crystal system to reduce viscosity. The liquid crystal properties of the cellulose/CaB/AMIMCl solutions were characterized using a polarizing microscope, torque rheometer and fourier transform infrared spectroscopy. The results showed that the liquid crystal phase appeared in a solution consisting of 3wt% CaB and 6wt% cellulose at temperature from 30 to 60&#xa0;°C. The liquid crystal dopes were then spun into cellulose/CaB blended fibers by dry-jet wet spinning method. The structure and properties of the fibers were characterized through scanning electron microscopy, x-ray diffractometer, single-fiber strength tester and UV testing. Compared to pure cellulose fiber, the blended fiber exhibited an increase in crystallinity, a 57.2% improvement in breaking strength, and an 80.8% reduction in UV transmittance. This research presents a novel approach for developing high-strength multifunctional fibers at a relative low cellulose concentration in ionic liquids.</p>

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Preparation of a novel cellulose/4- (ω (methyimidazole) alkyloxy) -4’- cyano azobenzene liquid crystal solution and its fiber

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Jun Song,
  • Chuanmeng Li,
  • Mengdie Wang,
  • Jicheng Shan,
  • LinFeng Wang,
  • Xuerong Wang,
  • Haijing Zhu,
  • Bin Li,
  • Chunzu Cheng,
  • Ting Li

摘要

To enhance the processability of cellulose ionic liquid solutions, a novel small molecule liquid crystal compound 4-(ω-(methyimidazole) hexyloxy) -4’-cyano-azobenzene (CaB) was designed and synthesized using 1,6-dibromohexane, 4-cyanoazophenol, and N-methylimidazole as the main raw materials. It was then added to a cellulose/ 1-Allyl-3-methylimidazole chloride (AMIMCl) solution to form a liquid crystal system to reduce viscosity. The liquid crystal properties of the cellulose/CaB/AMIMCl solutions were characterized using a polarizing microscope, torque rheometer and fourier transform infrared spectroscopy. The results showed that the liquid crystal phase appeared in a solution consisting of 3wt% CaB and 6wt% cellulose at temperature from 30 to 60 °C. The liquid crystal dopes were then spun into cellulose/CaB blended fibers by dry-jet wet spinning method. The structure and properties of the fibers were characterized through scanning electron microscopy, x-ray diffractometer, single-fiber strength tester and UV testing. Compared to pure cellulose fiber, the blended fiber exhibited an increase in crystallinity, a 57.2% improvement in breaking strength, and an 80.8% reduction in UV transmittance. This research presents a novel approach for developing high-strength multifunctional fibers at a relative low cellulose concentration in ionic liquids.