High-performance self-healing polymer composite films with dual-crosslinked networks for enhanced electromagnetic interference shielding

Developing high-performance self-healing electromagnetic interference (EMI) shielding materials remains challenging due to the trade-off between mechanical durability, conductivity, and healing capability. Herein, we design a polymer-based composite film with a dual-crosslinked network, integrating cellulose nanocrystals (CNC) and boric acid to enhance flexibility and self-healing efficiency. A benzenesulfonic acid-doped polyaniline-coated graphene (G@PANI) filler, synthesized via in situ polymerization, forms an efficient conductive network within the polyvinyl alcohol (PVA) matrix. The resulting film achieves an EMI shielding effectiveness (SE) of up to 50 dB in the X-band and Ku-band and exhibits a self-healing efficiency of 95 % under water-assisted conditions. This work provides a promising strategy for durable, flexible, and self-healing EMI shielding materials in smart electronics and aerospace applications.