Abstract
ESCA has been used to monitor the changes in the surface composition of polystyrene and 2-(2-hydroxy-3-vinyl-5-methylphenyl)-benzotriazole/styrene (HVB/sty) copolymers during uv ( λ > 300 nm) irradiation in air. Oxygen uptake in the surface is more rapid for the copolymers and is dependent on the benzotriazole content of the surface. On extended exposure the nitrogen content in the surface increases. The behaviour of the HVB in the surface is indicative of photo-sensitisation and not of photo-stabilisation.
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