The reliability of the lifetime predictions of polymeric materials is faced with comparing measurements obtained at low temperature with those carried out at high temperatures, in the molten state. The obtained data were treated by a well-established kinetics model and discrepancies were observed in the two different conditions (high and low temperatures), which led to mismatching between expected and real data. Correction of the data extrapolated from measurements obtained at high temperatures, by using a novel equation which takes into account the induction period (IP) of the degradation process, is proposed
Over the last thirty years, the environmental problems related to the disposal of plastics that have completed their lifecycle have begun to arise, and the need to foresee their end of life has become increasingly urgent.
The time to answer questions like: which parameter must be considered to perform correct and reliable lifetime prediction of materials? Could one make a prediction relying exclusively on data obtained at high temperatures? If, on the one hand, experimental experience and the literature confirm the importance of the calculation of the Ea of degradation to perform a lifetime prediction, the work carried out in these years and, above all, the correlations here put in place between the various data obtained, with different polymers and at different temperatures, from long-term experiments and the relative IPs, prove that we can not disregard this latter parameter in lifetime predictions.Prof. Ignazio Blanco, PhD
Materials (Basel) 2018 Aug 8;11(8). Epub 2018 Aug 8.
Department of Civil Engineering and Architecture, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
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