▎ 摘　　要

Polyimide (PI) and chemical modified graphene oxide nanocomposite films are prepared by in situ polymerization from solutions of pyromellitic dianhydride and 4,4-oxydianiline with various amount (0.5-2 wt%) of 3-aminopropyltriethoxysilane (APTS) functionalized graphene oxide (GO) sheets in dimethylacetamide. The APTS functionalized GO (GO-APTS) is a versatile platform for polymer grafting, improving excellent dispersion of GO in the PI matrix, and forming strong interaction with the PI matrix. The GO-APTS/PI nanocomposites exhibited improvement in mechanical and thermal properties by addition of a small amount of GO-APTS. With the addition of a small amount of GO-APTS (1.5 wt%) to PI matrix, mechanical properties with the tensile strength and Young's modulus improved by 45% and 15%, respectively. The thermal analysis showed that the thermal stability of PI was slightly enhanced by the incorporation of GO-APTS (1.5 wt%). This approach provides a strategy for developing high performance functionalized GO-polymer composite materials. POLYM. COMPOS., 37:907-914, 2016. (c) 2014 Society of Plastics Engineers