Conjugated Polymers Engineered for Flexible/Stretchable Electronics

ABSTRACT This review covers the state‐of‐the‐art advancements in conjugated polymers, which have been broadly used in wearable components, neuromorphic devices, soft robotics, and implantable bioelectronics. The specific focus is on how molecular structure dictates the glass transition temperature ( T g ) and subsequent device performance. The fundamental knowledge is reviewed on how backbone rigidity, side‐chain branching, and regioregularity serve as primary levers to tune the T g , which acts as the critical threshold for achieving skin‐like elasticity. By manipulating T g through molecular engineering, such as the incorporation of flexible spacers or bulky substituents, mechanical ductility can be successfully decoupled from the crystalline π–π stacking necessary for efficient charge transport. The structure‐processing‐property correlation for conjugated polymers, including the molecular weight, T g , thermo‐mechanical resilience, and electrical conductivity, is also reviewed. Recent “dynamic bonding” strategies are highlighted for their ability to lower the effective T g , allowing self‐healing and room‐temperature stretchability without compromising charge transport. By bridging the gap between molecular‐level glass transition physics and macro‐scale device durability, this review provides a roadmap for designing high‐performance, resilient conjugated polymers for next‐generation bioelectronics and neuromorphic interfaces.