▎ 摘　　要

Both aminopropylisobutyl polyhedral oligomeric silsesquioxane (NH2-POSS) and hydrazine monohydrate were utilized to functionalize graphene oxide (GO), and to obtain chemically modified graphene (CMG), which was then used for preparing thermally conductive CMG/polyimide (CMG/PI) nanocomposites via a sequential in situ polymerization and electrospinning-hot press technology. NH2-POSS molecules were grafted on the GO surface, and CMG was obtained by the reaction between NH2-POSS and GO. The thermal conductivity coefficient (lambda), glass transition temperature (Tg) and heat resistance index (THRI) of the prepared CMG/PI nanocomposites were all increased with increasing the CMG loading. The l value of the CMG/PI nanocomposites with 5 wt% CMG was significantly improved to 1.05 W m(-1) K-1, about 4 times higher than that of the pristine PI matrix (0.28 W m(-1) K-1). The corresponding Tg and THRI values were also increased to 213.0 and 282.3 degrees C, respectively. Moreover, an improved thermal conductivity model was proposed and predicted the l values of the nanocomposites more precisely than those obtained from the typical Maxwell, Russell and Bruggemen classical models.