Zhang P, Song L, Lu HD, Hu Y, Xing WY, Ni JX, Wang J (2009) Synergistic effect of nanoflaky manganese phosphate on thermal degradation and flame retardant properties of intumescent flame retardant polypropylene system. Polymer Degradation and Stability 94(2), 201-207. [In English]

Web link: http://dx.doi.org/10.1016/j.polymdegradstab.2008.11.004

Keywords:

Nanoflaky manganese phosphate, Intumescent flame retardant, Polypropylene, Synergistic mechanism, Thermal degradation, magnesium-hydroxide, zinc borate, formulations, melamine, agent, pentaerythritol, montmorillonite, polyethylene, flammability, calorimetry

Abstract: Nanoflaky manganese phosphate (NMP) was synthesized from manganese nitrate and trisodium phosphate dodecahydrate, and used as a synergistic agent on the flame retardancy of polypropylene (PP)/intumescent flame retardant (IFR) system. The thermogravimetric analysis (TGA), real time Fourier-transform infrared (RTFTIR) spectroscopy measurements, cone calorimeter (CONE) and microscale combustion calorimeter (MCC) were used to evaluate the synergistic effects of NMP on PP/IFR system. When IFR + NMP was fixed at 20 wt% in flame retardant PP system, the TGA tests showed that NMP could enhance the thermal stability of PP/IFR system at initial temperature from about room temperature to 440 degrees C and effectively increase the char residue formation. The RTFTIR results revealed that NMP could clearly change the decomposition behavior of PP in PP/IFR system, which promotes decomposition at the initial temperature from about room temperature to 260 degrees C and forms more effective barrier layer to protect PP from decomposing at high temperature from about 260 degrees C to 500 degrees C. The CONE tests indicated that the addition of NMP in PP/IFR system not only reduced the peak heat release rate (HRR), but also prolonged the ignition time. The MCC results revealed that PP/IFR/NMP system generated less combustion heat over the course of heating than that of PP/IFR system. And scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to explore the char residues of the PP/IFR systems with and Without NMR. (C) 2008 Elsevier Ltd. All rights reserved.