Mechanically Tough and Highly Stretchable Hydrogels Based on Polyurethane for Sensitive Strain Sensor

Hydrogels with flexible and stretchable properties are ideal for applications in wearable sensors. However, traditional hydrogel-based sensors suffer from high brittleness low electrical sensitivity. In this case, to solve dilemma, a macromolecular polyurethane crosslinking agent (PCA) was designed prepared; after that, PCA two-dimensional (2D) MXene nanosheets were both introduced into covalently crosslinked network enhance the comprehensive mechanical electrochemical of hydrogels. The promotes high-tensile strength highly capacity by suitable covalent crosslinking. optimized hydrogel, which exhibited maximum tensile elongation at break, had results 1.21 MPa 644%, respectively. Two-dimensional provide hydrogel conductivity strain sensitivity, producing device continuous monitoring human movements facial microexpressions. This study demonstrated an efficient structure design strategy building mechanically tough, stretchable, sensitive dual-mode MXenes-based