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The influence of thermal oxidative ageing on flame retardancy, thermal and mechanical properties of LGFPP/IFR composites

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Abstract

In this article, the composites based on long glass fibre reinforced polypropylene/intumescent flame retardant (LGFPP/IFR) were prepared by melt blending. The influence of thermal oxidative ageing on the LGFPP/IFR composites with different thermal oxidative ageing time at 140 °C was studied by means of oven heating. The thermal stability and flammability of the composites were respectively investigated by thermal gravimetric analysis (TG), limiting oxygen index (LOI), UL-94 test, cone calorimeter test (CCT), scanning electronic microscopy (SEM), mechanical properties test and energy-dispersive X-ray analysis (EDAX). A trend of increase first and then decrease in LOI values was shown in 0–50 days ageing, with the same trend as thermal stability obtained from TG in nitrogen condition. The CCT results indicated that the LGFPP/IFR composites after ageing achieved a higher heat release rate, which means a higher fire risk. The mechanical properties showed a global decrease in just 10 days ageing. Morphologies obtained from SEM showed that both the rupture of PP matrix and fibre interface debonding led to the decrease in mechanical properties. The EDAX proved that IFR particles could emerge and gather on the surface of sample in ageing procedure, which had great effects on the thermal stability and flame retardancy of the composites.

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Acknowledgements

This work is financially supported by Guizhou Province Science and Technology Fund (2015/7096), Special Funds of Guizhou Province Outstanding Young Scientists (2015/26), the National Natural Science Foundation of China (51763002 and 51003088) and High-level Innovative Talents Training Project of Guizhou Province (2015/4039, 2016/5667).

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Authors and Affiliations

  1. National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang, 550014, China

    Weidi He, Xiaolang Chen, Kun Zhang & Jianbing Guo

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

    Weidi He, Fei Qi, Na Wang & Xiaolang Chen

Authors
  1. Weidi He
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  2. Fei Qi
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  3. Na Wang
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  4. Xiaolang Chen
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  5. Kun Zhang
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  6. Jianbing Guo
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Correspondence to Xiaolang Chen or Jianbing Guo.

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He, W., Qi, F., Wang, N. et al. The influence of thermal oxidative ageing on flame retardancy, thermal and mechanical properties of LGFPP/IFR composites. J Therm Anal Calorim 131, 1017–1024 (2018). https://doi.org/10.1007/s10973-017-6679-4

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  • DOI: https://doi.org/10.1007/s10973-017-6679-4

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