Abstract
Recently it was postulated that natural variations of ozone concentration could have a big influence on the oven stability of polypropylene (PP). To examine this hypothesis the influence of low concentrations of ozone (comparable with environmental concentrations) on the thermo-oxidative degradation rate of PP-films was determined. PP-films were aged in a draft air oven with and without the addition of a small amount of ozone (maximum concentration ozone in the oven was 100–200 μg/m 3). The decrease of the elongation at break as function of oven ageing time was determined. It is shown that changes in the environmental concentrations of ozone have no significant influence on the rate of degradation in an oven.
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