Kinetics of thermo-oxidative degradation of zinc borate/microcapsulated red phosphorus with magnesium hydroxide in flame retarded polypropylene composites

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• 作者：Xiaolang Chen ; Jie Yu ; Zhu Luo ; Shuchun Hu ; Zuowan Zhou ; Shaoyun Guo and Shengjun Lu
• 关键词：Thermo ; oxidative degradation ; Kinetics ; Zinc borate ; Red phosphorus ; Magnesium hydroxide ; Polypropylene
• 刊名：Journal of Polymer Research
• 出版年：2009
• 出版时间：November, 2009
• 年：2009
• 卷：16
• 期：6
• 页码：745-753
• 全文大小：279.2 KB

文摘

The flammability and the thermo-oxidative degradation kinetics of zinc borate (ZB) and microcapsulated red phosphorus (MRP) with magnesium hydroxide (MH) in flame-retardant polypropylene (PP) composites were studied by limiting oxygen index (LOI), TGA, and FTIR spectroscopy. The results show that ZB/MRP is a good synergist for improving the flame retardancy of the PP composites. The Kissinger and Flynn-Wall-Ozawa methods were used to determine the activation energy (E) for degradation of PP composites. The results from the TGA curves indicate that the thermal stability of PP/MH/ZB and PP/MH/ZB/MRP composites is better than that of PP/MH composites. The kinetic results show that the values of E for degradation of PP/MH/ZB/MRP composites is much higher than those of PP/MH and PP/MH/ZB composites. The FTIR spectra data show that the incorporation of MH improves the thermo-oxidative stability of PP, especially for PP/MH composites with suitable content of MRP at higher temperatures. These data indicate that the synergistic flame retardants used in this work have a great effect on the mechanisms of pyrolysis and combustion of PP/MH composites.