Synergistic Flame-retardant Effect and Mechanism of Nitrogen–Phosphorus-Containing Compounds for Glass Fiber-reinforced Polyamide 66

2016 ◽  
Vol 56 (10) ◽  
pp. 1118-1127 ◽  
Author(s):  
Wenhua Chen ◽  
Pengju Liu ◽  
Yuansen Liu ◽  
Yuan Liu ◽  
Qi Wang
Keyword(s):  
Glass Fiber ◽  
Flame Retardant ◽  
Fiber Reinforced ◽  
Polyamide 66 ◽  
Glass Fiber Reinforced ◽  
Phosphorus Containing ◽  
Synergistic Flame Retardant ◽  
Nitrogen Phosphorus

scholarly journals Synergistic Charring Flame-Retardant Behavior of Polyimide and Melamine Polyphosphate in Glass Fiber-Reinforced Polyamide 66

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1851 ◽  
Author(s):  
Wei Tang ◽  
Yanfang Cao ◽  
Lijun Qian ◽  
Yajun Chen ◽  
Yong Qiu ◽  
...  
Keyword(s):  
Heat Release ◽  
Glass Fiber ◽  
Flame Retardant ◽  
Fiber Reinforced ◽  
Polyamide 66 ◽  
Limiting Oxygen Index ◽  
Char Layer ◽  
Glass Fiber Reinforced ◽  
Index Value ◽  
Synergistic Flame Retardant

The synergistic charring, flame-retardant behavior of the macromolecular charring agents polyimide (PI) and melamine polyphosphate (MPP) were studied in glass fiber-reinforced polyamide 66 (PA66). This kind of synergistic charring effect is explained by the fact that PI performed better char-forming ability while working with phosphorus content. The research results showed that, compared with the incorporation of individual MPP, MPP/PI with an appropriate ratio exhibited better flame retardancy and better charring ability. A blend of 11.9%MPP/5.1%PI/PA66 possessed an increased LOI (limiting oxygen index) value of 33.9% and passed the UL94 V-0 rating, obtained a lower peak heat release rate value (pk-HRR), a lower total heat release (THR) value, a lower total smoke release (TSR) value, and a higher residue yield. The results verified the synergistic flame-retardant effect between MPP and PI in the PA66 composite. Melamine polyphosphate and PI jointly interacted with PA66 matrix and locked more carbonaceous compositions in residue and formed a more compact char layer, resulting in a reduced burning intensity and a reduction in the release of fuels. Therefore, the enhanced flame-retardant effect of the MPP/PI system is attributed to the higher charring ability and stronger barrier effect of the char layer in PA66 in the condensed phase.

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