Investigation on Preparation, Mechanical, and Thermal Properties of Ultraviolet/Thermal Dual‐Curing Epoxy Resin Adhesive Modified by Graphene Oxide/Butadiene Rubber

ABSTRACT KH550 silane coupling agent modified graphene oxide (APTS‐GO) and terminal carboxylated nitrile rubber (CTBN) were introduced into ultraviolet/thermal dual‐curing E‐51 bisphenol A epoxy resin (EP) adhesive materials for the improvement of their impact resistance. The modification mechanism of the epoxy resin adhesive system was analyzed by proton nuclear magnetic resonance (H 1 ‐NMR) and Fourier transform infrared spectroscopy (FTIR). The impact modification effect of the adhesive system was evaluated by impact resistance under dynamic loading, combined with fracture morphology analysis. In addition, its tensile and thermal properties were systematically studied. The H 1 ‐NMR and FTIR analyses confirm the successful surface modification of graphene oxide, and graphene oxide/butadiene rubber (APTS‐GO/CTBN) is chemically bonded to the epoxy resin. The epoxy resin modified with 0.3 wt% APTS‐GO and 15 wt% CTBN (APTS‐GO/CTBN‐EP), cured using a UV/Thermal dual‐curing process, exhibits an impact strength of 4.11 kJ/m 2 and impact energy of 0.14 J, representing increases of 118.6% and 250% over the unmodified epoxy resin. Particularly, its tensile modulus and tensile strength were 447 MPa and 55.2 MPa, respectively. In addition, the decomposition temperature of the APTS‐GO/CTBN‐EP system was little changed compared to the unmodified EP, that is, within 4.56°C. When the content of APTS‐GO was 0.3 wt%, the glass transition temperature of APTS‐GO/CTBN‐EP was 98.62°C, 19.31°C lower than that of EP.