▎ 摘　　要

In-situ polymerized hyperbranched polyurethane (HPU) composites with poly(epsilon-caprolactone) (PCL)-functionalized graphene oxide (f-GO) sheets were prepared. Both their mechanical and laser-induced photothermal shape memory properties were investigated and compared with those of GO/HPU composites. The incorporation of f-GO in the HPU matrix significantly improved the mechanical properties of the composites such as the breaking stress, modulus, and elongation-at-break. The f-GO/HPU composites demonstrated an increase of 44 % and 43 % in the breaking stress and modulus, respectively, compared with the HPU. It was also observed that the f-GO/HPU composites demonstrated excellent near-infrared laser-induced shape recovery actuation with an enhanced rate of shape recovery. The improved mechanical and photothermal properties of the f-GO/HPU composites, compared with those of GO/HPU composites, can be attributed to the presence of more interactive sites consisting of HPU molecules with f-GO at the outer surfaces, and an improved dispersion of the graphene sheets in the HPU matrix because of GO functionalization.