A research group led by Prof. Zhu Jin at the Ningbo Institute of Materials Technology and Engineering (NIMTE) of the Chinese Academy of Sciences (CAS) developed a polyurethane with excellent properties of stretchability, toughness, self-healing and even thermal repair, which mimics the biological functionalities of human muscles. The study was published in Advanced Functional Materials.
source https://phys.org/news/2021-02-biologically-high-performance-polyurethane-stretchable-electronics.html