Abstract
The influence of the oxygen concentration and temperature on the UV-degradationchemistry of polyethylene is described. The degradations are characterized by measuring the oxygen uptake, the formation of CO and CO 2, the FT-IR spectra and the mechanical properties. At high temperatures (40–50 °C) an increase in the oxygen pressure (air versus 100% oxygen atmosphere) leads to a decrease of IR detectable products and to a higher amount of reacted oxygen necessary to cause mechanical failure. However, at low temperatures (29 °C) the influence of oxygen pressure is negligible. The results are explained assuming that the initiation of the photo-degradation is due to charge transfer complexes.
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