Flame retarding mechanism of Polyamide 6 with phosphorus-nitrogen flame retardant and DOPO derivatives

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机构：

[1] Li, Maolin

[2] Zhong, Yuhua

[3] Wang, Zheng

[4] Fischer, Andreas

[5] Ranft, Florian

[6] Drummer, Dietmar

[7] Wu, Wei

来源：

Drummer, Dietmar (drummer@lkt.uni-erlangen.de) | 1600年 / John Wiley and Sons Inc卷 / 133期

关键词：

A novel flame-retardant composite was prepared by introducing a phosphorus-nitrogen flame retardant and DOPO-SiO2 into PA6. DOPO-SiO2 was synthesized successfully in a one-step process. PA6/OP1314/DOPO-SiO2 achieved a UL 94 V-0 rating with an LOI value of 31%. The maximum mass loss rate of decomposition decreased significantly and char residue increased to 11.6 wt % compared with that of pure PA6. The compacted and dense char was formed due to the combination of the P-N flame retardant and DOPO-SiO2. The complex viscosity of PA6/OP1314/DOPO-SiO2 increased considerably which tend to prevent the dripping phenomenon. The flame-retardant mechanism of PA6/OP1314/DOPO-SiO2 was also investigated by Fourier transform infrared spectroscopy FTIR at different temperatures and the pyrolysis products were investigated by pyrolysis gas chromatography/ mass spectrum (Py-GC/MS). It was assumed that DOPO-SiO2 and the hypophosphite of OP1314 possess excellent flame retardancy during the gaseous phase. Meanwhile; melamine and phosphate reacted with the pyrolytic products of PA6 to protect the matrix during the condensed phase. © 2015 Wiley Periodicals; Inc;

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