Dynamic and Sustainable Polyurethane Elastomers for Wearable Electronics: From Green Synthesis to Self‐Healing and Circularity

Translating wearable electronics from rigid devices to compliant bio‐integrated platforms requires substrate materials that strictly reconcile mechanical robustness with environmental circularity. Conventional thermosetting elastomers fail to meet these criteria because their permanent crosslinked networks inhibit recycling and autonomous damage repair. Dynamic polyurethane elastomers (PUEs) resolve this fundamental bottleneck by leveraging highly tunable microphase‐separated architectures and reversible network chemistries. This review systematically summarizes the design principles of dynamic and sustainable PUEs and their development trajectories in wearable electronics. First, we elucidate how diverse reversible non‐covalent and covalent bonds synergistically endow materials with dynamic crosslinking and autonomous self‐healing capabilities to significantly extend device longevity. Furthermore, sustainable design paradigms are discussed, including green synthetic routes and diverse recycling processes facilitated by dynamic networks to achieve closed‐loop reuse and intelligent lifecycle management. Subsequently, conductive systems based on ion migration and electronic networks are tightly coupled with the polymer matrix to achieve stable electrical transmission without sacrificing stretchability. Finally, we outline the evolution of PUE‐based wearable electronics from simple strain sensors to complex integrated systems, highlighting the critical role of interdisciplinary approaches and artificial intelligence in resolving current performance tradeoffs and guiding future trends.