Abstract
The characterization of surface modifications of polymers, after irradiation with X-ray or UV photons, is abundant in the XPS literature, reporting from core level analysis the modification of surface chemical composition (loss of fluorine, or chlorine, or oxygen … content). This work focuses on the use of XPS valence band spectra to show that irradiation can lead to superficial structural modification — lateral chain grafting, or crosslinking — of so-called “reactive” (polytetrafluoroethylene) and even more “stable” (polypropylene and polyethylene) polymers: this is best evidenced by modification of the typical shape of the C 2s valence band. This structural modification appears more pronounced for high fluence UV excimer laser irradiation in air, than for (more moderate) exposition to harder X-rays in vacuo.
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