▎ 摘　　要

The simultaneous use of advantages of polysulfide polymers and epoxy resins encourages production of their blends. However, trying to introduce epoxy groups into polysulfide chains is a most interesting method to synthesis of a polymer with features of epoxy resins and polysulfide polymers. These resins can be cured by amine curing agents because of presence of epoxy groups. Herein, epoxidized polysulfide polymer/graphene nanocomposites were prepared via curing of epoxidized resin and epoxidized graphene nanosheets by diethylenetriamine. The modification of graphene oxide (GO) nanosheets with epichlorohydrin led to the formation of epoxidized GO nanosheets. Modification of GO was monitored by FT-IR and Raman spectroscopy, XRD and TGA analyses and SEM images. Dispersion of nanosheets in polymeric matrix was investigated by XRD and TEM. Thermal and thermophysical properties of nanocomposites were measured by TGA and DSC. Also, mechanical properties of nanocomposites were studied by Shore A hardness and tensile tests. Results showed that incorporation of nanosheets into polymeric matrix reduced the crystallinity of samples while T-g increased. Although XRD patterns showed no peak related to nanosheets, TEM proved that multilayer graphene nanosheets were dispersed in aggregated form. By increasing the amount of nanosheets up to 0.3 wt. %, hardness of nanocomposite samples increased due to the high modulus and aspect ratio of the nanosheets. By adding further nanosheets up to 1 wt. %, the hardness decreased associated with the formation of voids during the synthesis of nanocomposites in the high amounts of nanosheets.