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Kinetics of thermo-oxidative degradation of zinc borate/microcapsulated red phosphorus with magnesium hydroxide in flame retarded polypropylene composites

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Abstract

The flammability and the thermo-oxidative degradation kinetics of zinc borate (ZB) and microcapsulated red phosphorus (MRP) with magnesium hydroxide (MH) in flame-retardant polypropylene (PP) composites were studied by limiting oxygen index (LOI), TGA, and FTIR spectroscopy. The results show that ZB/MRP is a good synergist for improving the flame retardancy of the PP composites. The Kissinger and Flynn-Wall-Ozawa methods were used to determine the activation energy (E) for degradation of PP composites. The results from the TGA curves indicate that the thermal stability of PP/MH/ZB and PP/MH/ZB/MRP composites is better than that of PP/MH composites. The kinetic results show that the values of E for degradation of PP/MH/ZB/MRP composites is much higher than those of PP/MH and PP/MH/ZB composites. The FTIR spectra data show that the incorporation of MH improves the thermo-oxidative stability of PP, especially for PP/MH composites with suitable content of MRP at higher temperatures. These data indicate that the synergistic flame retardants used in this work have a great effect on the mechanisms of pyrolysis and combustion of PP/MH composites.

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Acknowledgements

The authors are grateful to Science and Technology Foundation of Guizhou province [(2008)7001], Hope Stars Foundation of Southwest Jiaotong University (2008–12), National 863 Project Foundation of China (2003AA32X230), and National Science and Technology Supporting Project Foundation of China (2007BAB08B05) for financial supports of this work.

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Authors and Affiliations

  1. Key Laboratory of Advanced Materials Technology Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Xiaolang Chen, Shuchun Hu & Zuowan Zhou

  2. National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, China

    Jie Yu, Zhu Luo & Shengjun Lu

  3. The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China

    Shaoyun Guo

Authors
  1. Xiaolang Chen
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  2. Jie Yu
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  3. Zhu Luo
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  4. Shuchun Hu
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  5. Zuowan Zhou
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  6. Shaoyun Guo
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  7. Shengjun Lu
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Correspondence to Xiaolang Chen or Jie Yu.

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Chen, X., Yu, J., Luo, Z. et al. Kinetics of thermo-oxidative degradation of zinc borate/microcapsulated red phosphorus with magnesium hydroxide in flame retarded polypropylene composites. J Polym Res 16, 745–753 (2009). https://doi.org/10.1007/s10965-009-9281-z

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  • DOI: https://doi.org/10.1007/s10965-009-9281-z

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