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Flame retardancy mechanisms of aluminium phosphinate in glass-fibre reinforced polyester
Glass-fibre reinforced poly(butylene terephthalate) (PBT/GF), flame retarded with aluminium diethylphosphinate and melamine cyanurate, is a halogen-free material that earns a V-0 classification in UL 94 test and exhibits an increased LOI (limit oxygen index) of 44%. Thus the understanding of the active flame retardancy mechanisms and the resulting fire behaviour is also of great interest with respect to applications. The flame retardancy mechanisms of aluminium diethylphosphinate and its combination with melamine cyanurate in PBT/GF were analysed by means of thermogravimetry (TG) and thermogravimetry coupled with evolved gas analysis (TG-FTIR (fourier transform spectroscopy)), cone calorimeter measurements using various irradiations, flammability tests (LOI, UL 94) and the chemical analyses of residues (FTIR (fourier transform spectroscopy), XRF (X-ray fluorescence), SEM/EDX (Scanning electron microscopy/energy dispersive X-ray spectroscopy)). During the decomposition of the flame retarded PBT/GF materials, diethylphosphinic acid was formed and released in the gas phase. The heat release was decreased due to the resulting gas-phase reactions of phosphorus-containing species. As a consequence of the diethylphosphinic acid formation, a minor amount of carbonaceous char also was induced in the condensed phase. The char stabilises the residue.
Flame retardancy mechanisms of aluminium phosphinate in glass-fibre reinforced polyester
Glass-fibre reinforced poly(butylene terephthalate) (PBT/GF), flame retarded with aluminium diethylphosphinate and melamine cyanurate, is a halogen-free material that earns a V-0 classification in UL 94 test and exhibits an increased LOI (limit oxygen index) of 44%. Thus the understanding of the active flame retardancy mechanisms and the resulting fire behaviour is also of great interest with respect to applications. The flame retardancy mechanisms of aluminium diethylphosphinate and its combination with melamine cyanurate in PBT/GF were analysed by means of thermogravimetry (TG) and thermogravimetry coupled with evolved gas analysis (TG-FTIR (fourier transform spectroscopy)), cone calorimeter measurements using various irradiations, flammability tests (LOI, UL 94) and the chemical analyses of residues (FTIR (fourier transform spectroscopy), XRF (X-ray fluorescence), SEM/EDX (Scanning electron microscopy/energy dispersive X-ray spectroscopy)). During the decomposition of the flame retarded PBT/GF materials, diethylphosphinic acid was formed and released in the gas phase. The heat release was decreased due to the resulting gas-phase reactions of phosphorus-containing species. As a consequence of the diethylphosphinic acid formation, a minor amount of carbonaceous char also was induced in the condensed phase. The char stabilises the residue.
Flame retardancy mechanisms of aluminium phosphinate in glass-fibre reinforced polyester
Braun, Ulrike (author) / Sturm, Heinz (author) / Schartel, Bernhard (author)
FR, Flame Retardants Conference, 13 ; 133-140
2008
8 Seiten, 5 Bilder, 3 Tabellen, 14 Quellen
Conference paper
English
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