Study on Preparation and Mechanical Properties for Graphene Oxide/Epoxy Resins Adhesives

In this study, graphene oxide (GO) was synthesized via Hummer’s method and subsequently integrated into an epoxy resin (EP) matrix using two distinct dispersion approaches: ultrasonic and emulsification dispersion to develop high-performance GO/EP adhesives (GO/EP-AD). At GO loading of 2 wt%, the adhesives exhibited shear strength of 31.94 MPa, demonstrating a 56% enhancement over pure EP. The storage modulus ( E' ) of the GO/EP composites (GO/EP-SH) prepared by emulsion dispersion reached 1.718 GPa, the glass transition temperature ( T _g ) is 127 ℃. Compared with that of ultrasonic dispersion, T _g has increased by 4 ℃. The tensile strength (58.9 MPa), elastic modulus (1.928 GPa), and impact strength (8.27 kJ/m²) of the composites increased by 42%, 58%, and 92% respectively compared with pure EP. The above experimental results confirm that the introduction of GO can effectively construct a three-dimensional reinforcing network and simultaneously improve the thermal stability and mechanical properties of the EP matrix because of the interface strengthening mechanism.