期刊
POLYMER DEGRADATION AND STABILITY
卷 144, 期 -, 页码 70-82出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2017.08.007
关键词
Schiff base; Polyphosphate; Polyurethane; Flame retardance
资金
- National Natural Science Foundation of China [51673132]
- Innovation Research Group Project of National Natural Science Foundation of China [51421061]
- Program for Sichuan Province Youth Science and Technology Innovation Team [2017TD0006]
A novel Schiff-base polyphosphate ester (SPE) flame retardant was synthesized through melt poly condensation, and used to flame retard thermoplastic polyurethane elastomer (TPU). The SPE possessed high thermal stability and rich char residue under high temperature according to the thermogravimetric (TG) analysis. In combustion tests, the flame-retarded TPU passed the UL-94 V-0 rating, and had a limited oxygen index (LOI) of 29% when the content of SPE was only 5 wt%, meanwhile, the amount of dripping remarkably reduced. In cone calorimetry test, the peak of heat release rate (pHRR), average mass loss rate (AMLR), and maximum average rate of heat emission (MARHE) of the flame-retarded TPU with 5 wt% SPE were respectively decreased by 61.7%, 41.8%, and 30.2% compared with the corresponding value of neat TPU. All these results demonstrated that the SPE simultaneously improved the flame retardancy and dripping behavior of TPU. Thermogravimetric-Fourier transform infrared spectra (TG-FTIR), pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and laser Raman spectroscopy (LRS) illustrated that SPE simultaneously played a flame-retardant role in both condensed phase and gas phase. (C) 2017 Elsevier Ltd. All rights reserved.
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