▎ 摘　　要

The fabrication of shape-memory polymers or films that can simultaneously heal the mechanical damage and polymeric films that can heal the mechanical damage and the In this study mechanically robust healable shape-memory the fatigued Shape-memory function remains Challenging. fatigued shape-memory function in the presence of water are fabricated by layer-by-layer assembly of branched poly(ethylenimine) (bPEI)-graphene oxide (GO) complexes with poly(acrylic acid) (PAA), followed by the release of the (PAA/bPEI-GO)*n films from the underlying substrates. The free-standing (PAA/bPEI-GO(0.02))*35 films made of bPEI-GO complexes with a mass lino of 0.02 between GO nanosheets and bPEI are mechanically robust with a Young's-modulus of 19.8 +/- 2.1 GPa and a hardness of 0.92 +/- 0.15 GPa and exhibit excellent humidity-induced healing and shape-memory functions. Benefiting from the highly efficient healing function, the (PAA/bPEI-GO(0.02))*35 film can heal cuts penetrating thorough the entire film and achieve an similar to 100% shape-recovery ratio for a long-term shape-memory application. Meanwhile; the shape-memory function of the mechanically damaged (PAA/bPEI-GO(0.02)) films can finely restored after being healed-in water. The shape-memory functions of the (PAA/hPEI-GO(0.02))*35 films and their healing capacity originate from the-reversibility of electrostatic and hydrogen-bonding interactions induced by water between PAA and bPEI-GO complexes.