7.
This paper reports a study on the effect of Al
2O
3 nanoparticles on the adhesion strength of steel-glass/epoxy composite joints bonded by a two-component structural acrylic adhesive. The addition of Al
2O
3 nanoparticles to the two-component acrylic adhesive led to a remarkable enhancement in the shear and tensile strength of the composite joints. The shear and tensile strength of the adhesive joints increased by addition of Al
2O
3 up to 1.5 wt%, which decreased by further addition of the nanofiller. Introduction of the nanoparticles caused a reduction in the peel strength of the joints. DSC analysis revealed that the glass transition temperature (Tg) of the adhesives rose by increasing the nanofiller content. The advancing water contact angle was decreased for adhesives containing nanoparticles. SEM micrographs indicated good dispersions of the Al
2O
3 nanoparticles within the acrylic matrix in the specimens with up to 1.5 wt% Al
2O
3 and revealed that addition of nanoparticles altered the fracture morphology from smooth to rough fracture surfaces.
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