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<p>The effects of different metal chloride salts on the solubilization, rheological properties, and the dry-jet wet spinnability of poly(p-phenylene-benzimidazole-terephthalamide) (PBIA) spinning solution are investigated. Results show that LiCl, MgCl<sub>2,</sub> and CaCl<sub>2</sub> all have solubilizing effects on PBIA polymer in DMAc solvent, while LiCl is the best co-solvent that works with DMAc. The rheology results indicate that the LiCl co-solvent spinning solution has the lowest viscosity, molecular chain entanglement density, and strongest thixotropy, which theoretically manifests that this solution has the best spinnability. Then, the extrusion situation verifies that the LiCl spinning solution exhibits the best fiber-forming ability and the broadest spinning temperature window. The tensile strength and elongation at break of as-spun fibers reach 4.76 cN/dtex and 30.64%, respectively. This work proves that it is practical to prepare PBIA fibers via the dry-jet wet spinning method, which is of great importance to increase production efficiency and broaden the application field of PBIA fibers.</p>

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The Effects of Different Co-solvents on the Rheological Property and Spinnability of Dry-Jet Wet Spinning for Heteroacycle Aramid Solutions

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Shuheng Liang,
  • Zhao Xu,
  • Jiayi Zhang,
  • Leyuan Shi,
  • Wanli Zhou,
  • Heng Wang,
  • Pengqing Liu,
  • Mengjin Jiang

摘要

The effects of different metal chloride salts on the solubilization, rheological properties, and the dry-jet wet spinnability of poly(p-phenylene-benzimidazole-terephthalamide) (PBIA) spinning solution are investigated. Results show that LiCl, MgCl2, and CaCl2 all have solubilizing effects on PBIA polymer in DMAc solvent, while LiCl is the best co-solvent that works with DMAc. The rheology results indicate that the LiCl co-solvent spinning solution has the lowest viscosity, molecular chain entanglement density, and strongest thixotropy, which theoretically manifests that this solution has the best spinnability. Then, the extrusion situation verifies that the LiCl spinning solution exhibits the best fiber-forming ability and the broadest spinning temperature window. The tensile strength and elongation at break of as-spun fibers reach 4.76 cN/dtex and 30.64%, respectively. This work proves that it is practical to prepare PBIA fibers via the dry-jet wet spinning method, which is of great importance to increase production efficiency and broaden the application field of PBIA fibers.