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<p>Enhancing the mechanical performance of synthetic fibers is pursued in aerospace, wearable devices, and protective textiles. However, current reinforcement methods rely on the chemical modification of polymer stock, introducing greater complexity and processing challenge. In this work, the mechanical properties of different aramid fibers and their composite fibers are improved through a cool spinning strategy. By reducing the coagulation temperature to –25&#xa0;°C, the interactions between polymer chains and solvent molecules are substantially enhanced, thereby improving the drawability of the polymer solution. The draw ratio markedly increases typically from 200% to 380%, leading to optimized oriented and crystalline structures. Consequently, the tensile strength, Young’s modulus and toughness of large-diameter heterocyclic <i>para</i>-aramid fibers increase by 112%, 123% and 118%, respectively. The cool spinning proposal is further applied to 36-μm-thick heterocyclic <i>para</i>-aramid/graphene oxide composite fibers, realizing elevated tensile strength, Young’s modulus and toughness of 6.28&#xa0;GPa, 119.62&#xa0;GPa and 172.7 MJ⋅m<sup>−3</sup>, respectively. This strategy is also applicable to <i>meta</i>-aramid fibers, where tensile strength increases up to 1.35&#xa0;GPa. The simple and universal cool spinning approach opens an avenue towards the preparation of high-performance fibers and composite fibers for structural and functional applications.</p> Graphical Abstract <p>A new cool spinning strategy for aramid fibers is proposed by reducing the coagulation temperature. This strategy dramatically enhances the interactions between polymer and solvent molecules, thereby increasing the draw ratio. It enables the preparation of different high-performance aramid fibers and their composite fibers with substantially improved tensile strength, Young’s modulus, and toughness.</p> <p></p>

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Cool Spinning Strategy for High-Performance Thick Aramid Fibers

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Lijun Liu,
  • Lidan Wang,
  • Kaiwen Li,
  • Dan Chang,
  • Chendong Ge,
  • Zheng Li,
  • Feifan Chen,
  • Xin Ming,
  • Yingjun Liu,
  • Weiwei Gao,
  • Zhen Xu,
  • Chao Gao

摘要

Enhancing the mechanical performance of synthetic fibers is pursued in aerospace, wearable devices, and protective textiles. However, current reinforcement methods rely on the chemical modification of polymer stock, introducing greater complexity and processing challenge. In this work, the mechanical properties of different aramid fibers and their composite fibers are improved through a cool spinning strategy. By reducing the coagulation temperature to –25 °C, the interactions between polymer chains and solvent molecules are substantially enhanced, thereby improving the drawability of the polymer solution. The draw ratio markedly increases typically from 200% to 380%, leading to optimized oriented and crystalline structures. Consequently, the tensile strength, Young’s modulus and toughness of large-diameter heterocyclic para-aramid fibers increase by 112%, 123% and 118%, respectively. The cool spinning proposal is further applied to 36-μm-thick heterocyclic para-aramid/graphene oxide composite fibers, realizing elevated tensile strength, Young’s modulus and toughness of 6.28 GPa, 119.62 GPa and 172.7 MJ⋅m−3, respectively. This strategy is also applicable to meta-aramid fibers, where tensile strength increases up to 1.35 GPa. The simple and universal cool spinning approach opens an avenue towards the preparation of high-performance fibers and composite fibers for structural and functional applications.

Graphical Abstract

A new cool spinning strategy for aramid fibers is proposed by reducing the coagulation temperature. This strategy dramatically enhances the interactions between polymer and solvent molecules, thereby increasing the draw ratio. It enables the preparation of different high-performance aramid fibers and their composite fibers with substantially improved tensile strength, Young’s modulus, and toughness.