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Flame-retardant effect of cross-linked phosphazene derivatives and pentaerythritol derivatives on polypropylene

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Abstract

A phosphazene-based flame retardant (PBFA) was synthesized by hexachlorocyclotriphosphazene and N-aminoethylpiperazine. To improve the flame retardancy of polypropylene (PP), PBFA and pentaerythritol derivatives (PEPA) were mechanically mixed to form a water resistance intumescent flame retardant (IFR). The flammability and thermal properties of the PP composites were analyzed by vertical burning test (UL-94), limit oxygen index, thermogravimetric analysis (TGA) and cone calorimeter test (CCT). The results indicate that there was a synergistic effect between PBFA and PEPA at a suitable mass ratio. When the mass ratio of PBFA/PEPA was 2:1, the PP composites can successfully achieve UL-94 V 0 rating. Compared with pure PP, the peak heat release rate and the total heat release were decreased by 75.40 and 15.38%, respectively; moreover, the total smoke production decreased by 22.11% during 0–465 s. The residual char after CCT was characterized by Fourier transform infrared spectrometer (FTIR). A strong pyrophosphate absorption peak was found in FTIR, indicating that the IFR mainly played a flame-retardant mechanism in the condensed phase.

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Acknowledgements

This work was supported by the Higher Education Science and Technology Research Project of Hebei Province [Grant numbers ZD2018011]; Key Research and Development Projects of Hebei Province [Grant numbers 19211205D].

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Authors and Affiliations

  1. Key Laboratory of Analytical Science and Technology of Hebei Province, The Flame Retardant Materials and Processing Technology Engineering Technology Research Center, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’s Republic of China

    Kailun Zhang, Tian Wang, Meng Yao, Jixing Xie & Yunhong Jiao

  2. Department of Foundation Courses, Agricultural University of Hebei, Cangzhou, 061100, People’s Republic of China

    Hongjuan Wu

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  1. Kailun Zhang
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  2. Hongjuan Wu
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  3. Tian Wang
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  4. Meng Yao
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  5. Jixing Xie
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  6. Yunhong Jiao
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Correspondence to Jixing Xie or Yunhong Jiao.

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Zhang, K., Wu, H., Wang, T. et al. Flame-retardant effect of cross-linked phosphazene derivatives and pentaerythritol derivatives on polypropylene. J Therm Anal Calorim 145, 3067–3075 (2021). https://doi.org/10.1007/s10973-020-09898-z

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  • DOI: https://doi.org/10.1007/s10973-020-09898-z

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