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Abstract
Abstract Polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) samples have been irradiated with X-rays, electrons and energetic heavy ions. Changes of electronic structure and chemical bonding have been studied by X-ray photoelectron spectroscopy (XPS). Under electron bombardment, a surface modification of PTFE is first observed (C =. C bond formation). Then bulk reticulation and new bond creation appears The variation of the C15 line with detection angle shows that the graphitization like process is restricted to the surface atomic layer. After the electron bombardment, a slow evolution of the polymer is observed as a function of time (aging process). PVDF appears to be more sensitive to ionizing radiation than PTFE. Indeed, modifications are observed under the X-ray probe. Rational mechanisms are proposed to explain the observed changes.
Published Version
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