Design of Intelligent Protective Composite Material with Stress Rate Sensitivity, Strong Interface Adhesion, and Recyclability

Abstract

AbstractPoly(dimethyl siloxane) (PDMS) elastomers play a significant role in smart materials, actuators, and flexible electronics. However, current PDMS lacks adhesion abilities and intelligent responsive properties, which limit its further application. In this study, the polydimethylsiloxane‐ureidopyrimidinone impact hardening polymer (PDMS‐UI) composites are manufactured by a dual cross‐linking compositing tactic. PDMS, a chemically stable cross‐linked network, acts as a framework owing to its excellent mechanical strength, whereas UI, a reversible dynamic physically cross‐linked network with quadruple hydrogen bonding, endows the PDMS‐UI with excellent self‐healing ability (efficiency > 90%) and energy absorption (75.23%). Impressively, owing to multivalent hydrogen bonds, the PDMS‐UI exhibits superior adhesion performance: the adhesion strength on various substrates exceed 150 kPa and that on the Ferrum substrate reaches 570 kPa. These outstanding properties make the PDMS‐UI a potential candidate for application in both well‐developed fields, such as, wearable protective materials, artificial skin and soft robotics.