期刊
POLYMER DEGRADATION AND STABILITY
卷 92, 期 8, 页码 1528-1545出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2007.05.007
关键词
flame retardancy; polyamide 6,6; metal phosphinate; melamine polyphosphate; zinc berate
The fire retardancy mechanisms of aluminium diethylphosphinate in combination with melamine polyphosphate and zinc borate was analysed in glass-fibre reinforced polyamide 6,6. The influence of phosphorus compounds on the polyamide decomposition pathways was characterized using thermal analysis (TG), evolved gas analysis (TG-FTIR), and FTIR-ATR analysis of the residue. The Lewis acid-base interactions between the flame retardants, the amide unit, and the metal ions control the decomposition. The flammability (LOI, LJL 94) and performance under forced-flaming conditions (cone calorimeter using different irradiations) were investigated. Fire residues were analysed with FTIR-ATR, SEM-EDX, and NMR. Aluminium phosphinate in polyamide 6,6 acts mainly by flame inhibition. Melamine polyphosphate shows some fuel dilution and a significant barrier effect. Using a combination of aluminium phosphinate and melamine polyphosphate results in some charring and a dominant barrier effect. These effects are improved in the presence of zinc borate due to the formation of boron-aluminium phosphates instead of aluminium phosphates. (c) 2007 Elsevier Ltd. All rights reserved.
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