Multifunctional epoxy nanocomposites reinforced by two-dimensional materials: A review

Epoxy resins are thermosetting polymers with an extensive set of applications such as anticorrosive coatings, adhesives, matrices for fibre reinforced composites and elements of electronic systems for automotive, aerospace and construction industries. Τhe use of epoxy resins in many high-performance applications is often restricted by their brittle and flammable nature, the relatively low fracture toughness and poor thermal and electrical properties. Various two-dimensional (2D) materials such as graphene (Gr), hexagonal boron nitride (h-BN), transition metal dichalcogenides and MXenes, provide vast opportunities to endow multifunctional properties and reinforce epoxy resins for advanced applications. In this review, the current literature status of epoxy nanocomposites reinforced with 2D materials has been thoroughly examined. The structures and intrinsic properties of epoxy resins and two-dimensional materials have been briefly summarized. Recent advances in the strategies of incorporating 2D materials into epoxy matrices have also been presented. Most importantly, the mechanical, tribological, thermal, electrical, flame retardant and anticorrosive properties of epoxy nanocomposites reinforced with 2D materials have been reviewed in detail. Finally, the current status of the field along with future perspectives have been discussed with regards to the effectiveness of various 2D nanofillers towards reinforcement.