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Effects of carbon fibers on the flammability and smoke emission characteristics of halogen-free thermoplastic polyurethane/ammonium polyphosphate

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Abstract

In the present study, the effects of carbon fibers (CFs) on flame retardancy, smoke emission, thermal and mechanical properties of thermoplastic polyurethane (TPU)/ammonium polyphosphate (APP) are investigated. The cone calorimeter results show that the combination of 15.00 wt% APP + 5.00 wt% CF greatly lowered peak heat release rate, total heat release, and total smoke release, as well as increased char residue, which is due to a compact char layer formed on the ablating surface of TPU-4 composites, as shown by the SEM results. Smoke suppression properties investigated by smoke density test demonstrate that CF combined with APP greatly reduced the smoke emission. The TPU composite containing 5.00 wt% CF has the highest LOI value of all the intumescing composites studied. Meanwhile, the addition of CF also caused enhanced mechanical properties of TPU composites to a certain degree. Thermogravimetric (TG) analysis indicates that CF combined with APP enhanced the high-temperature thermal stability of TPU composites compared with the pristine TPU, due to the increase of the char residue. Thermogravimetric analysis/infrared spectrometry (TG–IR) results demonstrate that CF could catalyze the further decomposition of TPU composites and remarkably reduce the production of aromatic compounds as a smoke precursor, which are the major parts of smoke.

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Acknowledgements

This study is financially supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 51576212 and 51534008, the Open Research Fund of Key Laboratory of Building Fire Protection Engineering and Technology of MPS (Grant No. KFKT2014ZD02), and the Fundamental Research Funds for Central Universities. The authors appreciate the supports deeply.

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Correspondence to Chang-kun Chen.

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Zhao, Xl., Chen, Ck. & Chen, Xl. Effects of carbon fibers on the flammability and smoke emission characteristics of halogen-free thermoplastic polyurethane/ammonium polyphosphate. J Mater Sci 51, 3762–3771 (2016). https://doi.org/10.1007/s10853-015-9694-5

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  • DOI: https://doi.org/10.1007/s10853-015-9694-5

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