Abstract

The use of multi materials within a single composite structure provides many advantages, including component cost reduction, the ability to manufacture complex designs and greater potential for part recyclability. However, these multi materials can often have very different properties and surface chemistries, and can be challenging to join when using adhesives. This research explores a new processing concept of surface treatment that promotes adhesion between dissimilar composite materials by introducing covalent bonding between substrate and adhesive. An epoxy amine resin is dissolved in a solvent to functionalise the surface of a polyamide 66 glass fibre composite prior to adhesive bonding to a carbon fibre epoxy composite. The effect of surface treatment time, temperature and solvent polarity is investigated using Fourier Transform Infrared (FTIR) spectroscopy, lap shear adhesion and scanning electron microscopy (SEM). Lap shear strength of some solvent treated samples is more than 3 times higher than the untreated samples, while the extent of epoxide cure correlates strongly with adhesive strength. Solvent polarity had little or no effect on the bonding strength providing flexibility in solvent selection.

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