The role of alumina nanoparticles in epoxy adhesives

摘要: Both untreated and calcined fumed alumina nanoparticles were dispersed into an epoxy-based adhesive at various percentages. The glass transition temperature of the nanofilled adhesives increased up to optimal filler loading then decreased, probably due concurrent contrasting effects chain blocking reduction crosslinking degree. Tensile modulus, stress break, fracture toughness bulk positively affected by presence content. Mechanical tests on single-lap aluminum bonded joints indicated that markedly improved both shear strength fatigue life joints. In particular, about 60% for content 1 vol.%, failure mechanism was evidenced all tested specimens. Concurrently, a relevant decrease equilibrium contact angle with water observed adhesives. summary, can effectively improve mechanical performances epoxy structural adhesives, increasing their properties enhancing interfacial wettability substrate.