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Electrochemical oxidation of o~-diamines on carbon fibers allows the bonding of these molecules to the carbon fibers. The conditions leading to this surface modification are described, and the influence of the different parameters is discussed. The structure of the bonded layer is studied by voltammetry, XPS, and SIMS. A mechanism is proposed which involves the coupling of a radical cation to the fiber. Toughness of carbon-epoxy composites is improved when prepared from these modified fibers.ABSTRACT Electrochemistry was used on-line with high-performance liquid chromatography with mass spectrometric and UV-vis spectrophotometric detection to characterize the electrochemical oxidation pathways of 6-thiopurine and 6-thioxanthine. At low potentials, the electrochemical oxidation of 6-thiopurine proceeds via one electron resulting in disulfide formation. It is proposed that purine-6-sulfenic acid is formed at potentials > +0.50V. Further oxidation of this unstable

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