4.7 Article

Shear-Thickening Fluid Using Oxygen-Plasma-Modified Multi-Walled Carbon Nanotubes to Improve the Quasi-Static Stab Resistance of Kevlar Fabrics

Journal

POLYMERS
Volume 10, Issue 12, Pages -

Publisher

MDPI
DOI: 10.3390/polym10121356

Keywords

O-2-plasma modified MWNTs; shear-thickening fluid; quasi-static stab resistance; body armors

Funding

  1. National Natural Science Foundation of China [11602168]
  2. Tianjin Research Program of Application foundation and Advanced Technology [15JCZDJC38400]

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The excellent mechanical property and light weight of protective materials are vital for practical application in body armor. In this study, O-2-plasma-modified multi-walled carbon nanotubes (M-MWNTs) were introduced into shear-thickening fluid (STF)-impregnated Kevlar woven fabrics to increase the quasi-static stab resistance and decrease the composite weight. The rheological test showed that the addition of 0.06 wt. % M-MWNT caused a marked increase in the peak viscosity from 1563 to 3417 pas and a decrease in the critical shear rate from 14.68 s(-1) to 2.53 s(-1). The storage modulus (G) and loss modulus (G) showed a higher degree of abrupt increase with the increase of shear stress. The yarn pull-out test showed that the yarn friction of M-MWNT/STF/Kevlar fabrics was far superior to the original fabrics. Importantly, under similar areal density, the M-MWNT/STF/Kevlar fabrics could resist 1261.4 N quasi-static stab force and absorb 41.3 J energy, which were much higher than neat Kevlar fabrics. The results of this research indicated that quasi-static stab resistance was improved by M-MWNTs, which was attributed to the excellent shear-thickening effect and the high yarn friction. Therefore, M-MWNT/STF/Kevlar fabrics have a broad prospect in the fields of body protection.

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