▎ 摘　　要

Amino-functionalized graphene (GE-NH2) was synthesized and characterized. A series of polyimide (PI)/GE-NH2 nanocomposites were then prepared by in situ polymerization. The influence of GE-NH2 content on mechanical properties and thermal stability of the as-prepared nanocomposites was investigated. It was found that the mechanical properties of the nanocomposites were enhanced with the increase of GE-NH2 loading. When the content of GE-NH2 was 0.5 wt%, the tensile strength of PI/GE-NH2 nanocomposites was up to 125.43 MPa (38.84% higher than that of neat PI). The modulus of PI/GE-NH2 was increased by 48.48%. The decomposition temperature at 5 wt% of weight loss for PI/GE-NH2 nanocomposites with 1 wt% of GE-NH2 was increased from 541 (neat PI) to 556 degrees C. The improvement of mechanical properties and the thermal stability of PI/GE-NH2 nanocomposites were due to the strong chemical bond and interfacial interaction between GE-NH2 and PI matrix.