Abstract
The effect of two commercial hindered piperidines, Tinuvin 770 and Hostavin N20, on the thermal oxidation of low density polyethylene (LDPE) in the melt is examined using Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), ultraviolet (uv) spectrometry and Melt Flow measurements. The results show that the hindered amines offer no thermo-stabilization and behave as pro-oxidants. In comparison, two phenolic antioxidants, Topanol (BHT) and Hostanox 03 (butyric acid 3,3-bis(3-tert-butyl-4-hydroxyphenyl) ethylene ester), show antioxidant behaviour, as expected, whereas dilauryl thiodipropionate (Hostanox SE 1) behaves as a pro-oxidant. The thermal degradation of LDPE films in air is also influenced by these additives. The implications of the results are discussed on the basis of antioxidant and nitroxyl radical effectively competing with oxygen for the macroalkyl radicals during melt processing. This competition is inefficient in the melt but not in the solid film.
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