Abstract

The effect of hindered amine stabilisers (HAS) on the thermal oxidation of low-density polyethylene (LDPE) films subjected to various gamma radiation doses in the range of 68–812 kGy, was studied by chemiluminescence (CL) at 190 °C in the presence of air. Different types of HAS were used, commercially known as Tinuvin 123, Sanduvor PR31 and Uvasil 299. It was found that under CL conditions, an antioxidative effect occurs for all unirradiated samples, being more relevant in the case of Sanduvor PR31. Our results indicate a specific decrease in the stability (depending on HAS nature) of irradiated materials with increasing irradiation dose. The initial intensity of CL emission ( I 0), which is related to the concentration of radiation-induced peroxy species was plotted as a function of dose and led to straight line dependence with the slope values placing the HAS effectiveness in the sequence: Tinuvin 123 > Sanduvor PR31 > Uvasil 299 ≫ none .

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