Abstract
AbstractThe variation of the photooxidation of PE‐LD films as a function of film thickness depends heavily on the exposure device used for artificial weathering. Carbonyl development is practically proportional to film thickness if high UV intensity artificial exposure devices are used. With less accelerating devices and on outdoor exposure, only limited increase with film thickness is observed. Then, an appreciable part of total oxidation is restricted to the surface layers. The differences between exposure devices are attributed to the absence of chain reactions in polyethylene with high UV intensity devices. With other accelerating devices and on outdoor exposure, chain reactions occur especially in the surface layers of the films where they involve usually oxidation products.
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