Frictional properties of Carbon Fiber tows adapted to Thermoplastic composites using acrylic‐styrene and nano‐modified sizing

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Abstract The coating, also called sizing, of Carbon fiber (CF) tows is vital for their protection. The frictional properties resulting from the presence of this sizing are an important factor for protection and processing. Today, most CF tows are sized with epoxy‐based formulations, but new formulations are being developed to make the sizing compatible with Thermoplastic (TP) matrix. A study of the friction of these sizings depending on their nature is thus vital. In this work, CF tows with sizing that are TP matrix compatible (Acrylic‐Styrene based) are compared for frictional properties using a capstan type friction machine. TP tow prepregs with Polyamide 6 resin are also tested. The addition of Graphene Oxide (GO) and ferrite modified‐GO to Acrylic‐Styrene sizing and their effect on the friction of CF tows is finally studied. Mostly, tow to metal contacts are investigated. This work shows the relationship between the Acrylic‐Styrene based sizing and friction changes. The addition of GO to the formulations further shows a reduction in the friction coefficient compared to the virgin Acrylic‐Styrene for tow to metal contact, but with a deperdition of the nanoparticles after friction for the ferrite‐modified one. Highlights Acrylic‐Styrene sizing reduces CF tow‐metal friction 33% versus epoxy. Nano‐modified GOFe 3 O 4 sizing lowers friction but causes particle depletion. Optimal 2% Acrylic‐Styrene sizing for CF tow cohesion and friction balance. PA6 towpregs show stable metal friction but high variability in self‐contact. Ferrite‐modified graphene sizing degrades post‐friction, increases roughness.

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