▎ 摘　　要

A novel hybrid of graphene-carbon nanotubes (HRGC) was prepared by tannic acid (TA)-functionalized reduced graphene oxide (RGO) and the amino-functionalized multi-walled carbon nanotubes (AMCNT). TA was used as the coupling agent for the successful low temperature nanowelding between RGO and AMCNT based on the Schiff base reaction. Due to the synergistic dispersion effect of RGO and AMCNT, which prevents restacking and re-aggregating of both RGO and AMCNT, HRGC hybrids were distributed evenly in the PA66 matrix. The inclusion of the HRGC as the structural reinforcement filler has improved the mechanical properties of PA66. With a 0.3 wt% HRGC loading, the tensile strength and Young's modulus can reach to 749.23 MPa and 3.06 GPa, respectively, which is increased by 109.5 % and 77.9 % compared with the neat PA66 fiber. In addition, the crystallinity, thermostability and thermal conductivity of HRGC/PA66 composites were all improved. It is believed that a new strategy of constructing the efficient graphene- carbon nanotubes hybrid fillers has been established.