Adhesive joints of carbon fiber/epoxy laminates were studied using an epoxy resin as the adhesive. In order to enhance the mechanical and electrical properties of epoxy adhesives, they were modified by the introduction of carbon nanofibers (CNFs). Also, different surface treatments, such as grit blasting, peel ply, and plasma, were applied to the laminates. The CNFs addition slows down the curing reaction of the epoxy adhesive although the final conversion is still high. The contact angle of nanoreinforced adhesives on the surface of treated laminates is lower than that of the neat epoxy resin. However, this increase of wettability scarcely modified the lap shear strength. Plasma treatment causes an important increase of the surface energy of laminates, markedly increasing the joint strength. The fracture mechanisms of the adhesive joints tested in the present study are strongly dependent on the surface treatment applied to the laminates.
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Prolongo et al. (2009) studied this question.
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