Abstract
Abstract For the first time, the temporal evolution of different types of polypropylene (PP) foams has been studied using time-resolved neutron radiography. This technique is advantageous since it allows visualizing the internal structure of polymeric foams inside metallic moulds during its production with excellent contrast in comparison to X-ray imaging. The experiments have been carried out in heated aluminium moulds exposed to a neutron beam (exposure time of 5 s) during a long time (1–2 h typically) thus observing the foam expansion and ageing (foam evolution at high temperature). Foam stability has been analysed as a function of different variables (liquid fraction –density–, blowing agent content and polymer rheology) by using quantitative parameters obtained by image analysis. These parameters are directly associated to cell size evolution and coalescence events. The results obtained allow determining the influence of rheological properties and process variables on the foaming behaviour of the polymer blends under study when the foaming process is carried out inside a metallic mould.
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