Fire retardant mechanism of PA66 modified by a “trinity” reactive flame retardant

ABSTRACT A “trinity” reactive flame retardant (TRFR) was successfully synthesized from pentaerythritol, phosphorus oxychloride (POC), and p‐aminobenzoic acid in two steps. The flame retardant polyamide 66 (PA66) was prepared by polymerizing TRFR with PA66 salt; the structural changes during the heat...

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Bibliographic Details
Published in:Journal of applied polymer science 2020-01, Vol.137 (1), p.n/a
Main Authors: Fu, Hao, Cui, Yihua, Lv, Jipeng
Format: Article
Language:English
Subjects:
Carbon
Char formation
Combustion
Dehydration
flame retardance
Flame retardants
Fourier transforms
Infrared analysis
Materials science
microscopy
Morphology
Phosphorus
Polyamide resins
polycondensation
Polymers
Raman spectroscopy
resins
spectroscopy
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Summary:ABSTRACT A “trinity” reactive flame retardant (TRFR) was successfully synthesized from pentaerythritol, phosphorus oxychloride (POC), and p‐aminobenzoic acid in two steps. The flame retardant polyamide 66 (PA66) was prepared by polymerizing TRFR with PA66 salt; the structural changes during the heating process, the morphology, and composition after combustion of flame retardant PA66 were analyzed. Fourier transform infrared, scanning electron microscopy, and Raman analysis results showed that the TRFR structure on flame retardant PA66 decomposed at the temperature of 25–550 °C, forming compounds containing phosphorus, carbon, and nitrogen, respectively. These compounds promoted the dehydration of the combustion surface to form char, increased the char formation rate, and produced nonflammable gases, resulting in a dense, porous, noncombustible carbon layer. The carbon layer may isolate oxygen and heat, thereby preventing the polymer from sustainability of combustion. When the TRFR salt content was 3%, TRFR flame retardant PA66 has excellent flame retardancy with limited oxygen index value of 29 and UL94 of V‐0 rating. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 47488. The FTIR spectra of TRFR flame retardant PA66 at different temperatures.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.47488