Transformative 4D Printed SMPs into Soft Electronics and Adaptive Structures: Innovations and Practical Insights

Shape memory polymers (SMP) have recently gained significant attention as multifunctional materials for flexible and wearable electronics applications. These polymers demonstrate smart functionalities, including self-healing and shape memory, with tunable, reversible responses that enhance advancements in soft electronics technology. The integration of smart materials with 3D printing (3DP) has also emerged as a transformative technology, enabling the creation of sophisticated architectures in the soft wearable electronics industry. This review highlights recent advancements in 3DP techniques that incorporate emerging multifunctional SMP materials for applications in e-electronics, soft actuators, biomedical devices, and many more. Strategies to commercialize this technology by addressing key challenges related to materials, 3DP technology, and multifunctionality on a large scale are discussed. Additionally, how 2D materials and sustainability can be integrated into 3DP to provide an innovative and robust platform for future researchers, with a focus on soft wearable electronics applications is explored. Finally, the current challenges in developing more advanced and practical applications are outlined and key future directions to foster further progress in this rapidly evolving field are discussed.