An Autonomously Ultrafast Self-Healing, Highly Colorless, Tear-Resistantand Compliant Elastomer Tailored for Transparent Electromagnetic InterferenceShielding Films Integrated in Flexible and Optical Electronics

Considering the operation reliability of flexible and optical electronics (FOEs) in dynamic and real-world environments, autonomous self-healing electromagnetic interference (EMI) shielding materials with high transparency, good stretchability and excellent tear-resistance are urgently desired, but always difficult to achieve due to the poor dynamics of their elastic substrates. Herein, we propose a facile strategy to design a highly dynamic polyurea elastomer (PDMS-MPI-HDI) featuring with ultrahigh optical transparency (>94%), ultralow elastic modulus (<1 MPa), high tear-resistant stretchability (800%), and ultrafast autonomous self-healing (100 s for scratch-healing). Taking PDMS-MPI-HDI as substrates for embedding of silver nanowires (Ag NWs), the first transparent, stretchable and self-healable EMI shielding materials (Ag NWs/PDMS-MPI-HDI) are presented. Failure behavior of Ag NWs/PDMS-MPI-HDI is highly tolerant of prefabricated cracks under deformation. Due to the robust interfacial adhesion between Ag NWs and PDMS-MPI-HDI, the fractured Ag NWs network can autonomously self-reconstruct during healing process of PDMS-MPI-HDI substrate, contributing to the complete restoration of EMI shielding effectiveness (SE), and full erasure of scratches both at the resting and stretching state. Besides, Ag NWs/PDMS-MPI-HDI also exhibits fast autonomous self-healing at high (60 ℃) and low (0 ℃) temperature, and in artificial sweat, which is essential for FOEs applicable in various practical environments.