X-Ray Photoelectron Spectroscopy and Raman Spectroscopy Studies of the Gamma-Irradiated Ethylene–Tetrafluoroethylene Copolymer

The chemical composition of the surface of a γ-irradiated ethylene–tetrafluoroethylene copolymer has been studied by XPS. The survey XPS spectrum of the initial and radiolyzed copolymer exhibits peaks attributed to fluorine, carbon, and oxygen atoms. Analysis of C 1s photoelectrons has shown that the relative intensity of the peak characteristic of the –CF2 group decreases in the irradiated copolymer. The fact that the amount of the CF2 group decreases during radiolysis has been also confirmed by a decrease in the intensity of the peak in the F 1s spectrum after irradiation. It has been shown that the carbon content in the irradiated copolymer increases; this finding suggests that the copolymer surface undergoes radiation-induced carbonization. The O 1s spectrum exhibits an intense peak characteristic of groups containing a C–O bond. An increase in the peak intensity with the radiation dose suggests that the copolymer surface undergoes significant radiation-induced oxidation to form oxygen-containing groups. The appearance of signals of the C=O and C=C bonds in the Raman spectra also indicates the radiation-induced oxidation and carbonization of the irradiated copolymer chain.

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