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Thermal properties and combustion behaviors of flame-retarded glass fiber-reinforced polyamide 6 with piperazine pyrophosphate and aluminum hypophosphite

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Abstract

Flame-retardant glass fiber-reinforced PA6 (GFPA6) composites were prepared by incorporating the mixture of piperazine pyrophosphate (PAPP) and aluminum hypophosphite (AHP) into GFPA6. From the results of UL-94 test, limiting oxygen index (LOI) and microscale combustion calorimetry (MCC) tests, the as-obtained composites exhibited significantly enhanced flame retardancy including higher LOI values, better UL94 rating (V-0 for 18.0 mass% PAPP/AHP mixture), and decreased peak heat release rate and total heat release. And PA6-4 with a 4/1 mass ratio of PAPP to AHP reached the highest LOI value. The influence of PAPP/AHP on the decomposition pathway of GFPA6 was discussed based on TG and TG-FTIR analysis. The interaction between PAPP/AHP and GFPA6 altered the decomposition pathway of GFPA6 resulting in the formation of compact char layer, high thermal stability within high-temperature region, and weak intensities of a variety of pyrolysis gas products. Meanwhile, the thermomechanical property data revealed the storage modulus of samples were increased with increasing PAPP/AHP content, whereas the glass transition temperatures were reduced gradually. Moreover, the results of scanning electron microscope illustrated that the introduction of PAPP/AHP mixture can promote the formation of compact char layer and change the surface element composition of the char.

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Acknowledgements

The work was financially supported by the Program for Science and Technology Talent of Shang Hai (15YF1405500) and the special development fund project of Shanghai Zhangjiang national innovation demonstration zone (201501-PT-C104-012).

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Authors and Affiliations

  1. Shanghai Research Institute of Chemical Industry, No. 345 East Yunling Road, Shanghai, 200062, People’s Republic of China

    Xiong Xiao, Shuang Hu, Jinguo Zhai, Tao Chen & Yongyi Mai

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  1. Xiong Xiao
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  2. Shuang Hu
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  3. Jinguo Zhai
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Correspondence to Shuang Hu.

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Xiao, X., Hu, S., Zhai, J. et al. Thermal properties and combustion behaviors of flame-retarded glass fiber-reinforced polyamide 6 with piperazine pyrophosphate and aluminum hypophosphite. J Therm Anal Calorim 125, 175–185 (2016). https://doi.org/10.1007/s10973-016-5391-0

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  • DOI: https://doi.org/10.1007/s10973-016-5391-0

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