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Influencing mechanism and interaction of muscovite on thermal decomposition of ammonium polyphosphate

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Abstract

The interaction mechanism and phase evolution of ammonium polyphosphate (APP) mixed with muscovite (APP/muscovite) were studied by TG, XRD and SEM, respectively, during heating. When the temperature is not higher than 300 °C, muscovite has no effect on the thermal decomposition of APP, and the initial decomposition temperature of APP/muscovite at 283 °C is basically the same as the APP at 295 °C, and the main thermal decomposition products are polyphosphoric acid and NH4H2PO4 at 300 °C. The polyphosphoric acid, the decomposition products of APP, can enable K and Si out of muscovite and interact with muscovite chemically to generate Al2O3·2SiO2, α-SiO2 and phosphates (AlPO4 and K5P3O10) compounds during 400 °C-800 °C, which own obvious adhesive phenomenon and porous structure with the apparent porosity of 58.4%. Further reactions between phosphates other than reactions among Al2O3·2SiO2 and α-SiO2 can generate KAlP2O7 at 1 000 °C and the density of residual product is improved by low melting point phosphate filling pore to form relatively dense structure and decrease the apparent porosity to 44.4%. The flame resistant and self-supported ceramic materials are expected to enhance the fire-retarding synergistic effect between APP and muscovite.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Sheng Hu  (胡盛), Fei Chen, Junguo Li, Qiang Shen  (沈强) & Lianmeng Zhang

  2. School of Chemical and Environment Engineering, Hubei University for Nationalities, Enshi, 445000, China

    Sheng Hu  (胡盛)

Authors
  1. Sheng Hu  (胡盛)
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  2. Fei Chen
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  3. Junguo Li
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  4. Qiang Shen  (沈强)
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  5. Lianmeng Zhang
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Correspondence to Qiang Shen  (沈强).

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Funded by the National Natural Science Foundation of China (No. 51472188)

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Hu, S., Chen, F., Li, J. et al. Influencing mechanism and interaction of muscovite on thermal decomposition of ammonium polyphosphate. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 334–339 (2016). https://doi.org/10.1007/s11595-016-1372-1

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  • DOI: https://doi.org/10.1007/s11595-016-1372-1

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