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Oxidative modification of carbon nanofibers (CNFs) is performed using the following methods: ball milling followed by oxidation in air, treatment with a nitric acid solution, and electrochemical treatment with a solution of sulfuric acid. The changes in the properties of CNFs are monitored by transmission elec tron microscopy (TEM), X ray photoelectron spectroscopy (XPS). The effect of the method by which carbon nanofibers are treated on the thermal-oxidative stability of epoxy composites containing the initial or mod ified CNFs is established.

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