Low-Temperature-Tolerant Strain-Sensing Flexible Composite for Soft Body Armor

Area of Science:

• Materials Science
• Composite Materials
• Wearable Technology

Background:

• Existing soft body armor lacks long-term protective effects and reliable stimulus response at subzero temperatures.
• Developing advanced materials for personal safety and wearable sensing is crucial for various applications.

Purpose of the Study:

• To create an anti-freezing, flexible, puncture-resistant composite with strain-sensing abilities for soft body armor.
• To evaluate the material's performance at both room and subzero temperatures.

Main Methods:

• Compounding a NaCl-soaked poly(vinyl alcohol)/sodium alginate/glycerol hydrogel (PSGN hydrogel) with Kevlar fabric.
• Subjecting the composite to freezing-thawing treatment and NaCl immersion.
• Testing puncture resistance, flexibility, and strain-sensing capabilities at 25 °C and -30 °C.

Main Results:

• The Kevlar/PSGN-10 composite demonstrated excellent puncture resistance and energy dissipation at -30 °C, significantly exceeding neat Kevlar fabric.
• The material exhibited stable, linear, and rapid strain-sensing behavior across a wide frequency range, even at -30 °C.
• The composite showed minimal reduction in flexibility and mass addition, ensuring wearable comfort and protection efficiency.

Conclusions:

• The developed Kevlar/PSGN composite offers superior anti-freezing, puncture-resistant, and strain-sensing properties for intelligent soft body armor.
• This material shows significant promise for enhancing personal safety and enabling advanced wearable applications in diverse temperature conditions.