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<p>The relationship between the viscosity and impact resistance of M-STF (Multi-walled carbon nanotubes doped shear thickening fluid) as well as its sensing mechanisms remains unclear. The synergistic effect of SiO<sub>2</sub> and MCNT (Multi-walled carbon nanotubes) content on the electrical resistance and rheological behaviour of M-STFs was studied. A novel design of using M-STF/TPU (Thermoplastic polyurethane tube with M-STF injected in) tubes as weft yarns to construct an impact-resistant smart 3D fabric was evaluated. The results revealed that the shear thickening effect of STF was enhanced with the increase of MCNT. The peak viscosity of M-STF70-0.5 (the mass ratio of SiO<sub>2</sub> and MCNT are 70% and 0.5%) was 16,400&#xa0;Pa·s with a lowest critical shear rate of 3.4&#xa0;s<sup>− 1</sup>. A positive correlation between the viscosity and electric resistance was witnessed in low viscosity M-STF systems. Among them, the resistance change rates of M-STF65-1.7/TPU and M-STF65-0.9/TPU systems were the most significant, and the sensing performance was stable and repeatable, which can effectively and stably feedback the waist motion signals. The peak force of M-STF/TPU/PPTA (para-aramid fabrics with M-STF/TPU tube as one of the weft yarns) composite was 19.51% higher than that of pure PPTA fabrics upon low-velocity impacts. The M-STF/TPU/PPTA composite is also highly sensitive to impact energy, with a sensitivity exceeding 9.12&#xa0;J<sup>− 1</sup>. Therefore, as an impact protective, smart in motion sensing compliant composite, M-STF/TPU/PPTA was successfully designed, which will broaden the applications of impact protective textiles.</p>

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Smart Compliant Composites for Impact Protection Based on Multi-Walled Carbon Nanotube Doped Shear Thickening Fluid

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Ying Chen,
  • Jiajia He,
  • Shengnan Min,
  • Jiamin Lin,
  • Zeyue Yan,
  • Xinru Xian,
  • Fang An,
  • Mengru Shi,
  • Xiaogang Chen

摘要

The relationship between the viscosity and impact resistance of M-STF (Multi-walled carbon nanotubes doped shear thickening fluid) as well as its sensing mechanisms remains unclear. The synergistic effect of SiO2 and MCNT (Multi-walled carbon nanotubes) content on the electrical resistance and rheological behaviour of M-STFs was studied. A novel design of using M-STF/TPU (Thermoplastic polyurethane tube with M-STF injected in) tubes as weft yarns to construct an impact-resistant smart 3D fabric was evaluated. The results revealed that the shear thickening effect of STF was enhanced with the increase of MCNT. The peak viscosity of M-STF70-0.5 (the mass ratio of SiO2 and MCNT are 70% and 0.5%) was 16,400 Pa·s with a lowest critical shear rate of 3.4 s− 1. A positive correlation between the viscosity and electric resistance was witnessed in low viscosity M-STF systems. Among them, the resistance change rates of M-STF65-1.7/TPU and M-STF65-0.9/TPU systems were the most significant, and the sensing performance was stable and repeatable, which can effectively and stably feedback the waist motion signals. The peak force of M-STF/TPU/PPTA (para-aramid fabrics with M-STF/TPU tube as one of the weft yarns) composite was 19.51% higher than that of pure PPTA fabrics upon low-velocity impacts. The M-STF/TPU/PPTA composite is also highly sensitive to impact energy, with a sensitivity exceeding 9.12 J− 1. Therefore, as an impact protective, smart in motion sensing compliant composite, M-STF/TPU/PPTA was successfully designed, which will broaden the applications of impact protective textiles.