Photochemical behaviour of fire-retarded polymers |
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Authors: | Denis Chantegraille Sandrine Morlat-Therias Jean-Luc Gardette |
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Institution: | a Laboratoire de Photochimie Moléculaire et Macromoléculaire (UMR CNRS-UBP 6505) Université Blaise Pascal (Clermont II) 63170 Aubière, France b ADDIPLAST, ZI Campine, allée Pierre et Marie Curie, 43620 St Pal de Mons, France |
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Abstract: | The influence of a non-halogenated intumescent fire retardant on the photooxidation of polypropylene is reported. The photooxidation of polypropylene stabilised with a phenolic antioxidant and two redox antioxidants (HALS), without and with the flame retardant has been studied. The chemical modifications resulting from UV-light exposure with wavelengths above 300 nm in the presence of oxygen were followed by IR and UV-visible spectroscopies. Special attention was given to the influence of each component on the rate of oxidation of the polymeric matrix. The photooxidation of the fire-retarded polymer can be described by two independent phenomena: the photooxidation of the intumescent agent and the photooxidation of the polymer. The results obtained offer new insight in the formulation of stabilised fire-retarded PP for outdoors applications. |
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Keywords: | Photodegradation Fire-retardancy Stabilisation Durability |
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