Self-healable castor oil-based waterborne polyurethane/MXene film with outstanding electromagnetic interference shielding effectiveness and excellent shape memory performance.

• A series of eco-friendly and renewable EMI shielding films were developed using disulfide linked WPU. • The healable films were castor oil-based and containing dynamic covalent bonds. • Over 99.999% EM waves (51.37 dB) were dissipated owing to the segregated structure. • Negligible change in shielding efficiency after bending 200 times or 80 °C aging. • The films performed remarkable shape memory behavior with full recovery and self-healing properties. Recently, the increasing demands of the portable devices and flexible electronics have caused lots of electromagnetic wave pollution. MXene, a novel two-dimensional material, was considered as a promising two-dimensional material for preparing flexible electromagnetic interference (EMI) shielding films. Herein, we firstly synthesized a series of flexible and self-healable EMI shielding waterborne polyurethane (ADWPU) films by mechanically blending with Ti 3 C 2 T x (ADWPU-T). Interestingly, the self-assembling between ADWPU and Ti 3 C 2 T x constructed a tunable analogical structure providing reflection-absorption-multiple reflection shielding mechanism. Furthermore, the ADWPU-T emulsions were prepared from castor oil which is a low-cost and eco-friendly biomass polyol. The chain extender 2-aminophenyl disulfide endow a reversible dynamic polymer network which leading to shape memory performance (45 °C heat treatment) and self-healing ability (60 °C, 5 min healed). Above all, these multifunctional flexible films also exhibited outstanding EMI shielding performance (51.37 dB) and performed less decrement after 200 times bending and 80 °C aging test for five days. Therefore, this work would provide a novel promising method for preparing responsive electromagnetic interference shielding products and smart electronic devices. [ABSTRACT FROM AUTHOR]