The evaluation of global migration and the assessment of related parameters by a spectrophotometric methodology

In this work, the theory and measurement of migration is discussed in terms of the assessment of the ‘change’ of migration as a function of time. Instead of residue measurement, migration can also be evaluated very quickly and with high accuracy by spectrophotometric means. From these data the maximum possible global migration Mx can be found, which allows one to predict quality behaviour of plastics. Also other effects such as weathering and influences from transport-conditions can be evaluated. It is clear that the proposed testing procedure does not interfere with the conventional weight-procedure. Indeed, the simulant can be removed for residue measurements at any time. The importance of the proposed methodology is the time response wherein assessment can be performed and knowledge of the migrational behaviour of the plastics can be found.