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Electrocopolymerization of a high‐temperature 3‐carboxyphenylmaleimide‐styrene interphase onto graphite fibers was carried out in an effort to toughen graphite—epoxy composites. The effects of the interphase and its thickness on the mechanical properties and the failure modes were investigated. The optimum interphase thickness was found to be about 0.16 μm. At this thickness, the average value of the DCB Mode I critical strain energy release rate is improved by about 100%, the average notched Izod impact resistance is improved by about 60%, and the average interlaminar shear strength is maintained at about the same value as the control composites. The failure mode was shifted toward more ductile failure with the inclusion of an interphase.
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Wimolkiatisak et al. (1992) studied this question.
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