▎ 摘　　要

Graphene (GR) sheets were successfully prepared via solvent interface trapping. Characterization of GR was performed using Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM), and UV-Vis spectrometer. GR was trapped in gum acacia (GA) and polyacrylamide (PAAm) to form GA/PAAm/GR nanocomposite using gamma irradiation technique. In situ preparation of the magnetic nanocomposite and the magnetization was measured. Characterization the prepared nanocomposites was done using (FT-IR), (FESEM), (HRTEM), (XRD), (TGA). It can be obtained that a high swelling percent was observed for all systems that increased with time until reached the steady state after 5h and the maximum was at pH 10. The swelling percent were ordered in sequence of GA/PAAm-magnetic>GA/PAAm/GR-magnetic>GA/PAAm>GA/PAAm/GR. The thermal stability of the magnetic nanocomposite was higher than non-magnetic one. The mechanical properties were determined using nanoindentation. The elastic modulus and the hardness of GA/PAAm matrix increased by adding GR and GR-magnetic in the nanocomposites.