▎ 摘　　要

Carboxyl modifiedgraphene oxide is important in the preparation of functionalized graphene oxide (GeneO). In this work, the free radical initiator agent azobisisobutyronitrile (AIBN) was functioned as a modifier. AIBN could be separated into isobutyronitrile radicals to attack the five-membered ring and seven-membered ring defects in the graphene oxide. Then the cyanogroup-modified graphene oxide intermediates were formed, and the carboxyl graphene oxide [GeneO-C (CH3)(2)-COOH] could be obtained through the hydrolysis reaction. The structure and properties of GeneO-C (CH3)(2)-COOH were characterized by Fourier transform infrared spectroscope (FTIR), X-ray diffraction (XRD), thermo gravimetric analyzer (TGA) and atomic force microscope(AFM). And the blood compatibility of GeneO-C (CH3)(2)-COOH was evaluated by recalcification time test. It was showed that the recalcification time gradually decreased as the increasing concentration of GeneO-C (CH3)(2)-COOH, indicating that the material had good blood compatibility. Carboxyl group content could be controlled by the mass ratio of AIBN to GeneO. This method not only could increase the carboxyl content of oxidized graphene, but also made the material have a good blood compatibility.