Bio‐Inspired PBO Fiber‐Based Composite Yarn With Hierarchical Dissipative Scale Structure for Impact Resistance Smart Protection Fabric

ABSTRACT Protective textiles with advanced stimuli‐responsive capabilities provided an all‐around protection for the human body in a lightweight and flexible way, significantly endowing the highly intelligent modern society with unlimited potential in transforming lifestyles. However, achieving both perceptual capabilities and efficient protective performance remains a great challenge. Here, drawing inspiration from the classical armor shell of pangolin, a multiple interfacial crosslinking‐induced strategy is presented to manufacture a coaxial hierarchical structure composite yarn. The core principle of this design involves constructing a hierarchical energy dissipated macro‐/micro‐/nano overlapped plate scale structure based on multiple interfacial cross‐linking valence bonds between mica microplate fillers and GA‐modified polyborosiloxane (GPBS) fillers (GPBS@TiO 2 ‐mica) and fiber substrates, which endows the composite yarn with excellent mechanical performances (strength of 193.7 MPa, toughness of 235.09 MJ m −3 ). The resulting fabric exhibits superior impact resistance (efficiency>74 %), excellent ballistic energy absorption capacity (7.94 kJ m −1 ), excellent structural stability, good pressure stimulus sensitivity (1.69 V kPa −1 ), and shows the application potential in monitoring human activities and health. This study provides a promising strategy for the future development of advanced wearable smart textiles with exceptional impact resistance.