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Synthesis of APP@MOFs integrated hybrids flame retardants for reducing flammability of thermoplastic polyurethanes

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Abstract

In this manuscript, the UiO-66-NH2(Zr) (MOFs) was adopted to modify ammonium polyphosphate (APP), and the novel synergistic integrated flame retardant system (APP@MOFs) was formed. The flame retardants were incorporated to the thermoplastic polyurethanes (TPU) matrix, and the effects of APP@MOFs on reducing flammability of thermoplastic polyurethanes were compared and investigated. The results show that the flame retardant and smoke suppression performances of TPU/APP@MOFs composites are improved significantly. The pHRR, THR, SPR, TSP, YCO, and YCO2 of TPU/APP@MOFs composites decreased by 75.76%, 86.19%, 69.74%, 86.34%, 57.14%, and 76.37% in comparison with pure TPU. Furthermore, the char residues increased from 0.11 (pure TPU) to 32.3% (TPU/APP@MOFs composites). Generally, the APP@MOFs have great effect on improving the flame retardant and smoke suppression performances of TPU due to the catalytic carbonization and dilution effects of APP, the synergistic and catalysis effects of MOFs. Through the char structure analysis, the mechanism of the TPU/APP@MOFs composites during the combustion processes was also investigated and proposed.

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Funding

This work was financially supported by the National Natural Science Foundation, China (No. 52074247 and 52274232).

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Authors and Affiliations

  1. Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing, 100012, China

    Congling Shi, Mei Wan, Xiaodong Qian, Honglei Che & Jian Li

  2. School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing, 100083, China

    Congling Shi & Mei Wan

Authors
  1. Congling Shi
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  2. Mei Wan
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  3. Xiaodong Qian
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  4. Honglei Che
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  5. Jian Li
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Contributions

Formal analysis, CLS, MW, XDQ; Investigation, CLS, MW, XDQ; Methodology, CLS, XDQ; Writing-original draft, MW, XDQ; Writing-review and editing, CLS, MW, XDQ, HLC, JL All authors have read and agreed to the published version of the manuscript.

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Correspondence to Xiaodong Qian.

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Shi, C., Wan, M., Qian, X. et al. Synthesis of APP@MOFs integrated hybrids flame retardants for reducing flammability of thermoplastic polyurethanes. J Therm Anal Calorim 149, 2777–2787 (2024). https://doi.org/10.1007/s10973-024-12881-7

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  • DOI: https://doi.org/10.1007/s10973-024-12881-7

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