Abstract
ESCA has been used to monitor the changes in the surface chemistry of low density polyethylene during exposure to uv light (γ > 300 nm) and γ-radiation. In photo-oxidation, oxygen uptake is reflected by CO, and OCO functional group formation and the rate of reaction is shown to decrease gradually in the top 150 Å of the exposed surface. By the use of sandwich layers, the extent of oxygen uptake in the front surface is found to be double that at a depth of 20 μm. γ-irradiation shows similar trends to photo-oxidation although the extent of oxidative functionalisation is less.
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