Abstract
Chemiluminescence (CL) and imaging chemiluminescence (ICL) were used to study the thermo-oxidative stability of polyamide 6 in the temperature range of 100–140°C. The CL intensity time curves (CL curves) for both unstabilised and stabilised polyamide 6 film indicated an initial period at a high intensity level of varying shape followed by a basically sigmoidal increase and a subsequent maximum. This maximum was found to occur at a time corresponding to a drop in strain at break. Polyamide 6, stabilised with the phenolic antioxidant Irganox 1098, showed a similar CL curve although shifted towards lower intensity levels and longer times. The ICL study revealed essentially homogeneous oxidation. Both the ICL study and the CL studies clearly indicated oxidation from the beginning of ageing, also in the presence of the phenolic antioxidant. The CL intensity is not directly related to the rate of oxygen uptake. Instead, the CL intensity in oxygen seems to be related to the content of peroxides. However, other species causing luminescence cannot be excluded.
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