▎ 摘　　要

Expandable graphite oxide (EGO) was functionalized with different amine groups after sequential steps as thermal expansion, oxidation, acylation, and amidation. Three types of amino-functionalized graphenes (a-Gphs) were prepared by exfoliating amino functionalized EGOs(a-EGO) through controlled ultrasonication. Fourier transform infrared spectroscopy, elementary analysis, X-ray diffraction, and thermogravimetric analysis separately confirmed the chemical structure of a-EGO. The effect of ultrasonic power on the particle sizes of exfoliated a-EGOs was estimated by dynamic light scattering. Single layered graphene (0.43 nm) was achieved after ultrasonicating at 500 W for 20 min, which was affirmed by the results of atomic force microscopy and transmission electron microscopy. Ultra violet-visible spectroscopy also indicates the good dispersion properties of a-Gphs in these solvents. The thermal properties of composites are obviously increased by adding a-Gphs and a-EGOs as nanofillers. POLYM. COMPOS., 31:1987-1994, 2010. (C) 2010 Society of Plastics Engineers