Thermolysis behavior of flame-retardant copolyamide 66 (FR-PA66) in the presence of triaryl phosphine oxide (TPO) has been studied using different techniques such as differential scanning calorimetry, thermal gravimetric analysis, Fourier transform-infrared spectroscopy, and gas chromatography–mass spectrometry. The results indicate that TPO extends the thermolysis time of FR-PA66, and improves the thermolysis temperature. A three-stage mechanism for the decomposition of FR-PA66 has been proposed in this article. In the first stage, cleavage of P–C bond takes place in FR-PA66, while in the second stage, cleavage of polyamide chain occurs mainly. In the third stage, formation of cyclic compounds proceeds along with the formation of carbonized protective layer on the degraded polymer.
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The study has been supported by the Natural Science Foundation of Shanxi (Grant No. 2010021022-3), and the Scientific Research Foundation of the Higher Education Institutions of Shanxi Province, China (Grant No. 2010115).
Yang XF, Li QL, Chen ZP, Han HL. Fabrication and thermal stability studies of polyamide 66 containing triaryl phosphine oxide. Bull Mater Sci. 2009;32:375–80.CrossRefGoogle Scholar
Pokholok TV, Gaponova IS, Davydov EY, Pariiskii GB. Mechanism of stable radical generation in aromatic polyamides on exposure to nitrogen dioxide. Polym Degrad Stab. 2006;91:2423–8.CrossRefGoogle Scholar
Al-Salem SM, Lettieri P, Baeyens J. Recycling and recovery routes of plastic solid waste (PSW): a review. Waste Manag (Oxford). 2009;29:2625–43.CrossRefGoogle Scholar
Gu H, He JM, Hu JH, Hong D. Thermal degradation kinetics of semi-aromatic polyamide containing benzoxazole unit. J Therm Anal Calorim. 2012;107:1251–7.CrossRefGoogle Scholar
Ghost S, Khastgir K, Bhowmick AK, Mudunda PG. Thermal degradation and ageing of segmented polyamides. Polym Degrad Stab. 2000;67:427–36.CrossRefGoogle Scholar
Lide DR. CRC handbook of chemistry and physics. 87th ed. Boca: Taylor and Francis; 2006. p. 412–3.Google Scholar
Hao JW, Xiong YB, Zhang T. Flame retardancy study on phosphorus-containing epoxy resin synthesized by the reaction of DOPO and the diglycidyl ether of bisphenol A. Trans Beijing Inst Technol. 2006;326:279–82.Google Scholar
Howell BA, Dumitrascu A. Thermal and combustion characteristics of phosphorus and phosphorus/nitrogen-containing styrene monomers and oligomers. J Therm Anal Calorim. 2004. doi: 10.1007/s10973-012-2463-7.
Liu Y, Yi JS, Cai XF. The investigation of intumescent flame-retarded polypropylene using poly(hexamethylene terephthalamide) as carbonization agent. J Therm Anal Calorim. 2012;107:1191–7.CrossRefGoogle Scholar
Herrera M, Matuschek G, Kettrup A. Main products and kinetics of the thermal degradation of polyamides. Chemosphere. 2001;42:601–7.CrossRefGoogle Scholar
Li R-F, Hu XZ. Mechanism of thermo oxidative degradation of polyamide. Acta Polym Sin. 2000;2:136–41.Google Scholar
Balabanovich AIEJ. Fire retardant and charring effect of poly(sulfonyldiphenylene phenylphosphonate) in poly(butylene terephthalate). Polym Degrad Stab. 2003;79(1):85–92.CrossRefGoogle Scholar
Bourbigot SBML, Delobel R, Bréant P, Trémillon J. Carbonization mechanisms resulting from intumescence-part II. Association with an ethylene terpolymer and the ammonium polyphosphate-pentaerythritol fire retardant system. Carbon. 1995;33:283–94.CrossRefGoogle Scholar
Jeng RSS, Lin J, Su W, Chiu Y. Flame retardant epoxy polymers based on all phosphorus-containing components. Eur Polym J. 2002;38:683–93.CrossRefGoogle Scholar
Ban DWY, Yang B, Zhao G. A novel non-dripping oligomeric flame retardant for polyethylene terephthalate. Eur Polym J. 2004;40:1909–13.CrossRefGoogle Scholar