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Synthesis of Organic-Inorganic Hybrid Aluminum Hypophosphite Microspheres Flame Retardant and Its Flame Retardant Research on Thermoplastic Polyurethane

  • Organic Materials
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Abstract

Aluminum hypophosphite microspheres (AHP) were synthesized by hydrothermal method using NaH2PO2-H2O and AlCl3·6H2O as raw materials, and then the AHP microspheres were polymerized by surface polymerization of micro-nanospheres with cyclic cross-linked poly(cyclotriphosphazene-co-4. 4′-sulfonyldiphenol) (PZS). A new organic-inorganic poly(phosphonitrile)-modified aluminum hypophosphite microspheres (PZS-AHP) were synthesized by encapsulation and applied to flame retardant thermoplastic polyurethane (TPU). The microstructure and chemical composition of the PZS-AHP microsphere were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray spectroscopy. The thermal stability of PZS-AHP microsphere was explored with thermogravimetric analysis. Thermogravimetric data indicate that the PZS-AHP microspheres have excellent thermal stability. The thermal and flame-retarding properties of the TPU composites were evaluated by thermogravimetric (TG), limited oxygen index tests (LOI), and cone calorimeter test (CCT). The TPU composite achieved vertical burning (UL-94) V-0 grade and LOI value reached 29.2% when 10 wt% PZS-AHP was incorporated. Compared with those of pure TPU, the peak heat release rate (pHRR) and total heat release (THR) of TPU/10%PZS-AHP decreased by 82.2% and 42.5%, respectively. The results of CCT indicated that PZS-AHP microsphere could improve the flame retardancy of TPU composites.

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Authors and Affiliations

  1. Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, 430205, China

    Shengpeng Liu  (刘生鹏), Zhi Xu, **nyuan Zhang, Huan Wei, Yun **ong & Yigang Ding

  2. Hubei Three Gorges Laboratory, Yichang, 443007, China

    Wenbo Huang & Lili Xu  (许莉莉)

  3. School of Technology Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China

    Lili Xu  (许莉莉)

Authors
  1. Shengpeng Liu  (刘生鹏)
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  2. Zhi Xu
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  3. **nyuan Zhang
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  4. Huan Wei
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  5. Yun **ong
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  6. Yigang Ding
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  7. Wenbo Huang
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  8. Lili Xu  (许莉莉)
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Correspondence to Lili Xu  (许莉莉).

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Supported by the Opening Project of Hubei Three Gorges Laboratory (No.SK213008) and the Innovation Fund of Key Laboratory of Green Chemical Process of Ministry of Education (No. GCXP202109)

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Liu, S., Xu, Z., Zhang, X. et al. Synthesis of Organic-Inorganic Hybrid Aluminum Hypophosphite Microspheres Flame Retardant and Its Flame Retardant Research on Thermoplastic Polyurethane. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 221–233 (2024). https://doi.org/10.1007/s11595-024-2875-9

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  • DOI: https://doi.org/10.1007/s11595-024-2875-9

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