Abstract
Although Hindered Amine Stabilizers (HAS) originally only were used as UV-Stabilizer, it is nowadays well known that they act as stabilizers against the thermo-oxidative degradation of polypropylene (PP) too. Their mechanism of action is different from the traditionally used phenolic antioxidants (PAO). A comparison was made between the effectivity of a PAO and a HAS as long-term heat stabilizer. It is found that both types of stabilizer interfere in different ways in the degradation of PP. These differences will be clarified using results on the degradation of unstabilized PP and model experiments with decalin, decalin / lauryladehyde mixtures and squalane. For oligomeric HAS types containing different aliphatic amines in their backbone, differences in activity were found. For these HAS types, it is shown that parts of the backbone can act as stabilizer too.
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