▎ 摘　　要

We have explored graphene oxide (GO) and sulfonic acid-functionalized graphene oxides (GO-SO3H) as efficient reinforcements to improve the performances of the polyethersulfone (PES). In contrast to GO, the numerous terminal -SO(3)(-)groups in GO-SO3H nanosheets not only promoted the filler dispersion in PES matrix, but also formed strong interfacial adhesion via H-bonding and dipole-dipole interactions. The tensile strength of PES was enhanced by around 3-folds and 5-folds upon incorporation 5 wt% GO and GO-SO3H nanosheets, respectively. The improvement of tensile modulus of PES is considerably higher with GO-SO3H nanosheets compared to GO. The superior tensile properties of the PES/GO-SO3H nanocomposites could be ascribed to the better dispersion of GO-SO3H nanosheets and the efficient stress transfer between PES matrix and GO-SO3H nanosheets, which is well supported by X-ray diffraction and morphological analyses. The loading capacity of the GO-SO3H was found be higher than that of GO. The dc conductivity of the PES/GO-SO3H nanocomposites was recorded greater than that of the GO-reinforced nanocomposites. The thermo-oxidative stability of the PES matrix was substantially improved upon inclusion of both the GO and GO-SO3H, but the GO-SO3H showed better effects. Overall, the as-prepared PES/GO-SO3H hybrid nanocomposite can be used as potential material in different membrane applications.