▎ 摘　　要

In this study, the new amphiphilic copolymer of sodium-4-styrenesulfonate (SS) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) [poly(SS-co-AMPS)] was prepared and first used as an effective stabilizer to prepare a high concentration and stable aqueous dispersion of graphene. It was found that the high concentration of the stable graphene dispersion can reach up to 12.0 mg/mL using the copolymer as a stabilizer. FT-IR and UV-Vis study show that owing to the coexistence of pi-pi interaction, hydrophobic attraction, and hydrogen bonding, the poly(SS-co-AMPS) exhibits a high adsorptivity for graphene sheets. In addition, the electrostatic repulsions and stereo-hindrance effect supplied by the sulfonic groups (-SO3-) and the side chain can prevent the pi-pi stacking of graphene sheets effectively. The morphology of the exfoliated graphene sheets was investigated by atomic force microscopy and transmission electron microscopy with a 3.9-nm average thickness. Furthermore, this polymer-functionalized graphene can also be dispersed very well in polar organic solvents, such as N,N-dimethylmethanamide, acetone, and ethanol, to form stable homogeneous suspensions.