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Thermal stability and fire safety of polycarbonate flame retarded by the brominated flame retardant and a non-antimony synergistic agent

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Abstract

Aiming at developing a non-antimony synergistic agent of BFR and improving the high heat and smoke release of BFR due to its gaseous phase flame retardant mechanism, CeHPP was synthesized through hydrothermal reflux method and introduced into PC/DBDPO through melt blending. The morphology, chemical structure and thermal stability of CeHPP were characterized through SEM, FTIT and TG analysis, while the flame retardancy of PC/DBDPO/Sb2O3 and PC/DBDPO/CeHPP composites were compared and discussed in detail. To our delight, CeHPP showed more excellent synergistic effect with DBDPO than Sb2O3 in PC matrix. For PC/DBDPO/CeHPP (92/7/1, wt%), the sample was not ignited, the value of limited oxygen index (LOI) went up to 39.2% and it reached UL 94 V0 rating in vertical burning test, while the Izod impact strength, elongation at break and Young’s modulus were almost kept same with those of pure PC. Moreover, according to the cone calorimetry, CeHPP and DBDPO/CeHPP could efficiently suppress the heat and smoke release of PC composites, while DBDPO and DBDPO/Sb2O3 would accelerate the heat and smoke release during combustion The synergistic flame retardant mechanism verified that the char-barrier effect of CeHPP transferred the free-radical-trapping effect of BFRs from the gaseous phase to the condensed phase, which interfered the chain oxidation reaction of free-radicals and inhibiting the release and spread of gases and smoke.

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Acknowledgements

This work was supported by the Zhejiang Province Public Welfare Technology Application Research Project (LGG21E030004), the National Natural Science Foundation of China (51991355, 52173082), the Ningbo Major Special Projects of Science and Technology Innovation 2025 (2020Z052) and the Ningbo Natural Science Foundation (2021J149, 2021J155).

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Authors and Affiliations

  1. Laboratory of Polymer Materials and Engineering, NingboTech University, Ningbo, 315100, China

    Bingtao Wang, Runfeng Ye, Zhenghong Guo, Juan Li, Zhengping Fang & Shiya Ran

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  1. Bingtao Wang
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  2. Runfeng Ye
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  3. Zhenghong Guo
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  4. Juan Li
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Correspondence to Zhenghong Guo.

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Wang, B., Ye, R., Guo, Z. et al. Thermal stability and fire safety of polycarbonate flame retarded by the brominated flame retardant and a non-antimony synergistic agent. J Polym Res 30, 240 (2023). https://doi.org/10.1007/s10965-023-03586-w

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