Is there any reference to explain the polymeric bonding mechanism of epoxy resin polymeric adhesives to carbon fiber reinforced polymer (CFRP) laminates or strips. I am a structural engineer and I would like to understand the chemistry aspect of this bonding process.
You did not specify the resin used for CFRP. The adhesion mechanism all depends on what resin is used for making the composite. However, both thermoplastic matrix or cross-linked thermosetting polymer all exhausted the chemical reactivity by making the composite laminates. Even for a popular matrix for making a composite, epoxy resin matrix, the chances are that the epoxy does not have chemical functional groups left to form covalent bonds with the epoxy adhesive. This leaves the secondary bonding interactions, such as hydrogen bonding, van der Waals interaction and mechanical interlocking, the only bonding mechanisms. For example, an epoxy used for making CFRP will have residual hydroxyl groups to which the epoxy adhesive can hydrogen bond. In case you can heat treat the bonded system to rather high temperature, these hydroxy group can potentially form ether bond (covalent bond), but this is not a usual situation if you use room temperature or near room temperature curing conditions. In case the composite laminate surface can be roughened, then the epoxy adhesive can form some mechanical interlocking, which will further enhance the adhesion.
https://www.sciencedirect.com/search/advanced?qs=resin%20epoxy%20adhesives%20to%20CFRP%20laminates
The bonding is due to reduction in interfacial tension between epoxy adhesive and laminate.
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