Abstract
ABSTRACT Degradation of polypropylene (PP) and polystyrene (PS) surfaces under electron beam in ultra-high vacuum is studied by electron spectroscopy, pattern recognition, and atomic force microscopy. Effects on hydrogen, carbon sp2/sp3 content, and microstructure are quantified and correlated. Electron irradiation at 1500 eV causes hydrogen and C sp3 content decrease and surface morphology modification. Roughness changes from 29 to 15 nm on PP, whereas it remains 5 nm on PS. Decreasing C sp3 content in PP, contrary to PS, indicates C–H, C–C bonds scission and carbonization. Cross-linking predominates over carbonization in PS, confirming its better stability, in agreement with surface morphology data.
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