Printable, Adhesive,\nand Robust Ion-Conductive Elastomers\nand Their Applicability as Self-Powered Multiresponse Sensors

Flexible sensors with versatile sensations and self-powered\nfunctions\nhave received increasing attention. However, it is still a challenge\nto simultaneously integrate multiresponse property with other functionalities\nin a facile and sustainable way. Herein, we prepared a robust and\nstretchable composite by polymerizing acrylic acid (AAc) and a triblock\ncopolymeric cross-linking agent, Pluronic F127 diacrylate (F127DA),\nwith lithium as the conductive ion. A dual cross-linking single network,\ncontaining both the physical cross-linking site assembled by oxypropylene\nsegments on F127DA and the covalently bonded chemical cross-linking\npoint, was constructed, which, together with synergistic hydrogen\nbonding between AAc and oxyethylene segments, accounts for the mechanically\nrobust (∼8 MPa in tensile strength), highly stretchable (∼1000%\nelongation at break), and highly transparent properties. The high\nconductivity of about 10<sup>–4</sup> S/cm is attributed to\nboth the oxyethylene segments on F127DA and the residual bound water\non network, with the latter also accounting for the antifreezing properties.\nThe simultaneous strain and humidity sensor were developed based on\nthis skin-like ionoelastomer, and the application in triboelectric\nnanogenerator further expands the material’s horizon to energy\nharvesting and makes it self-powered.