Controlled Design of a Robust Hierarchically Porous and Hollow Carbon Fiber Textile for High‐Performance Freestanding Electrodes

摘要： It is difficult to simultaneously get high mechanical strength and high self-healing efficiency within a short healing time for self-healing polyacrylate coatings reported so far. Herein, derived from multi-maleimide terminated hyperbranched polysiloxane, linear polyacrylate with furan-containing side chain and polydopamine particles (photothermal conversion agent), a new kind of polyacrylate coating (HPA) with a strong and flexible crosslinking network was developed, which simultaneously shows high mechanical strength and high self-healing efficiency within a short time. With 0.3 wt% polydopamine particles in HPA, the resulting coating (HPA3) has the highest toughness (2.63±0.10 MPa) with 12.9±0.7 MPa of tensile strength and 23.9±1.6% of elongation at break; what’s more, the self-healing efficiency of HPA3 is over 87.6% after only 2.5 min near-infrared laser irradiation, overcoming intractable problems in developing self-healing polyacrylate coatings. The study on the mechanism behind these outstanding performances of HPA system reveals that the reversible covalent crosslinking formed by multi-maleimide terminated hyperbranched polysiloxane is the necessary and crucial factor for simultaneously getting high mechanical strength and high self-healing efficiency at short time.