Thermoplastic Polyurethanes as Carbonization Agents in Intumescent Blends. Part 1: Fire Retardancy of Polypropylene/Thermoplastic Polyurethane/Ammonium Polyphosphate Blends

摘要

This work deals with the fire retardancy of polypropylene (PP)/thermoplastic polyurethane (TPU)/ammonium polyphosphate (APP) intu- mescent blends, using TPU with different chemical compositions and struc- tures. The influence of the chemical nature of the polyol used in the synthesis of the TPU on the fire resistance of materials is discussed. Moreover, smoke pro- duction from combustion of the blend and mechanical properties (elonga- tion/stress relation) of the polymeric materials are studied. Improved flame retaded (FR) materials with very different mechanical properties according to the composition of the TPU can be formulated.