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 Ti3C2Tx (ADWPU-T). Interestingly, the self-assembling between ADWPU and Ti3C2Tx 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.
Keywords: Analogic segregated structures; Castor oil; EMI shielding; MXene; Self-healable; Shape memory polymer; Waterborne polyurethane.
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