Abstract
The imaging photon counting technique was introduced to study polymer oxidation at the beginning of the 90s. The technique, referred to as imaging chemiluminescence (ICL), enables the measurement of both the intensity and the spatial distribution of the weak luminescence from thermo-oxidised polymers. In the short history of ICL measurements the technique has provided data of various aspects of the heterogeneous oxidation of polymers, e.g. diffusion limited oxidation, localisation of stress induced oxidation and the physical spreading of oxidation. The advances in ICL are briefly summarised and recent results obtained by monitoring the oxidation depth profiles in polybutadiene rubber and the physical spreading of oxidation between EPDM particles are presented. The potential and the limitations of the technique are discussed in some detail.
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