Effect of modification of the surface of carbon fibers on the reaction with epoxy matrices

Adhesive interactions of epoxy-4,4-isopropylidenediphenol (EDT-10) and epoxy-novolac binders (ENDB) with the surface of domestic carbon fibers based on polyacrylonitrile were studied. Fibers with an untreated surface and with a surface activated by the electrochemical method of anode oxidation were studied. Fibers whose surfaces were treated with finishing agents based on polyvinyl acetate or a water-soluble epoxy composite were also investigated. It was found that the cohesive strength of the components and of carbon plastics could be strengthened by activating the surface of the fibers. Oxidative treatments of a carbon filler were found to increase adhesion both in the stage of contact formation with the binder and after curing of the system.