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Comparison of Flame-retardancy Property and Mechanism between a Phosphate Ester and a Phosphoramine Flame-retardants

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Abstract

A halogen-free flame-retardant (hydroquinone bis (N, N’-diarylphosphoramidate), 4N-HDP) containing phosphorus-nitrogen was synthesized. Its structure was characterized by infrared spectroscopy (IR), nuclear magnetic resonance (1H-NMR and 31P-NMR). Thermogravimetric analysis (TG), limiting oxygen index (LOI), UL-94 vertical burning test (UL-94), thermogravimetric-infrared instrument (TG-IR) and scanning electron microscopy (SEM) were used to compare the flame-retarding performance and mechanism of hydroquinone bis (diphenyl phosphate) (HDP) and 4N-HDP. TG, IR and TG-IR were used for comparative analysis, indicating that both HDP and 4N-HDP are flame-retardants, and the gas phase and condensed phase act synergistically. In the pyrolysis process, it is divided into two steps: the first step is the breakage of large molecules to small molecules; the second step is the gasification and carbonization of small molecules, and eventually produces phosphate ester and non-flammable gases. Through the comparison of various results, it could be found that 4N-HDP has better flame-retarding performance compared to HDP in the composite with polycarbonate (PC).

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Authors and Affiliations

  1. School of Chemical Engineering, Sichuan University, Chengdu, 610065, China

    Shiqian Qin  (秦仕千), Zhiyi Yang, Shuai Zhang, Zhiye Zhang, Xinlong Wang, Xiushan Yang, Tao Luo & Lin Yang  (杨林)

Authors
  1. Shiqian Qin  (秦仕千)
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  2. Zhiyi Yang
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  3. Shuai Zhang
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  4. Zhiye Zhang
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  5. Xinlong Wang
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  6. Xiushan Yang
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  7. Tao Luo
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  8. Lin Yang  (杨林)
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Corresponding author

Correspondence to Lin Yang  (杨林).

Additional information

Funded by the National Key Research and Development Program of China (No.2016YFD0200404), the Sichuan Science and Technology Program (No.2018RZ0145), and the National “Double First-Rate” Strategic Plan of Sichuan University, China (No.2030704401004)

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Qin, S., Yang, Z., Zhang, S. et al. Comparison of Flame-retardancy Property and Mechanism between a Phosphate Ester and a Phosphoramine Flame-retardants. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 36, 148–156 (2021). https://doi.org/10.1007/s11595-021-2388-8

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  • DOI: https://doi.org/10.1007/s11595-021-2388-8

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