Abstract
Developments of position-sensitive photon detectors and charged coupled device (CCD) cameras, have made it possible to measure thermo-oxidative degradation of polymers in real-time with high precision (imaging chemiluminescence, ICL). The main problems in using this technique to determine the stability of multiple samples are the appearance of temperature gradients and the possibility of infection of neighbouring specimens, which can lead to a decrease of their stability. These problems are overcome with the apparatus presented. With this new apparatus the obtained chemiluminescence (CL) intensity-time curves of 23 unstabilised polypropylene PP powder samples overlapped after normalisation, indicating a constant temperature and an effective gas flow distribution in the cells of the specimen chamber. It is also shown that the sensitivity of the apparatus is very high. Thus, the stability of a single PP particle of less than 10 μg could be determined.
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