This work deals with the effect of recycling on halogen-free flame retarded polypropylene blends. The intumescent ammonium polyphosphate/polyamide-6/polypropylene blend is considered. The study of the fire properties using cone calorimeter shows a decrease in the fire performance. Recycling the blends induces chemical modifications of polymer and additives. The chemical modifications due to the recycling are investigated by solid state31P NMR. It is shown that APP is degraded. These modifications induce a loss of the ammonium contents, which could explain the decrease in the fire performance.
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