Abstract
Surface properties of polyacrylonitrile (PAN) based carbon fibres and their adhesive strengths with epoxy resin are investigated. The surfaces of PAN-based carbon fibres were characterized by krypton adsorption and oxygen chemisorption, amount of acidic surface functional groups, X-ray photoelectron spectroscopy and Raman spectroscopy. Interfacial shear, interlaminar shear and transverse tensile strengths were measured as the interfacial adhesive strengths. The epoxy resin used for the embedded single filament specimens was the same as that used in the matrix of the composites. Empirical equations between surface properties and adhesive strengths were calculated. All adhesive strengths in this study showed the best correlation with the active surface area ratio, defined as the surface area ratio of oxygen chemisorption to krypton adsorption. From these relationships, the effect of each surface property on adhesive strength is discussed.
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