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Flame retardancy and thermal degradation properties of polypropylene/wood flour composite modified with aluminum hypophosphite/melamine cyanurate

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Abstract

In this study, aluminum hypophosphite (AP) and melamine cyanurate (MCA) were used as flame retardant in polypropylene (PP)/wood flour (WF) composite. The flammability of the PP/WF composites was examined by the limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test. When the PP/WF composite was loaded with 20% AP/MCA (the mass ratio of AP and MCA was 5: 1), the UL-94 achieved V-0 rating and the LOI was increased to 29.5%. In addition, the flexural strength was increased by about 11.0%. The results of cone calorimeter test revealed that the heat release rate and heat release rate peak of the PP/WF composite with AP/MCA were significantly reduced. The thermal degradation mechanism of PP/WF composites was investigated by thermo-gravimetric analysis, Fourier transform infrared spectrometry, energy-dispersive X-ray spectroscopy and scanning electron microscopy. The results indicate that AP/MCA had the effect of gas-phase and condensed-phase flame retardancy during the combustion and degradation of PP/WF composite. Consequently, a thermal property reinforcing mechanism of the PP/WF composite with AP/MCA was presented.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (31570572 and 31670516) and Heilongjiang Key Project Technologies R&D Programme (GA15A101).

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Authors and Affiliations

  1. College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China

    Panpan Zhao, Chuigen Guo & Liping Li

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  1. Panpan Zhao
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  2. Chuigen Guo
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  3. Liping Li
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Correspondence to Liping Li.

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Zhao, P., Guo, C. & Li, L. Flame retardancy and thermal degradation properties of polypropylene/wood flour composite modified with aluminum hypophosphite/melamine cyanurate. J Therm Anal Calorim 135, 3085–3093 (2019). https://doi.org/10.1007/s10973-018-7544-9

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  • DOI: https://doi.org/10.1007/s10973-018-7544-9

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