Pyrolysis and combustion study of flexible polyurethane foam
Pyrolysis and combustion study of flexible polyurethane foam
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DOI：
10.1016/j.jaap.2014.12.017
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发表时间：
2015-05-01
影响因子：
6
通讯作者：
Font, R.
中科院分区：
文献类型：
--
作者：
Garrido, M. A.;Font, R.
采用热重分析（TG）、热重-红外光谱（TG-IR）和热重-质谱（TG-MS）研究了不同条件下软质聚氨酯泡沫塑料的热降解过程。对于动力学研究，在三种不同的气氛（N-2、N-2：O-2 4：1和N-2：O-2 9：1）中以不同的加热速率（5、10和20 ℃ min（-1））进行动态和动态+等温运行。得到了两个反应模型，一个是热解，另一个是燃烧降解（N-2：O-2 4：1和N-2：O-2 9：1），同时关联的实验数据，从动态和动态+等温运行在不同的加热速率。考虑的热解模型包括两个连续的反应，活化能为142和217.5 kJ mol（-1）和反应级数为0.805和1.246。然而，为了模拟燃烧运行的实验数据，采用了三个连续的反应，活化能分别为237.9、103.5和120.1 kJ mol（-1），反应级数分别为2.003、0.778和1.025。采用TG-IR和TG-MS对样品进行表征，所得结果表明，FPUF在惰性气氛下开始分解，破坏聚氨酯键，产生长链醚，这些醚在下一步中立即降解。然而，在氧化气氛下，在第一步中，不仅氨基甲酸酯键断裂，而且一些醚多元醇开始降解，finished.at在第二步中产生在最后阶段降解的炭。(C)2015 Elsevier B. V.版权所有。
The thermal degradation of flexible polyurethane foam has been studied under different conditions by thermogravimetric analysis (TG), thermogravimetric analysis-infrared spectrometry (TG-IR) and thermogravimetric analysis-mass spectrometry (TG-MS). For the kinetic study, dynamic and dynamic+isothermal runs were performed at different heating rates (5, 10 and 20 degrees Cmin(-1)) in three different atmospheres (N-2, N-2:O-2 4:1 and N-2:O-2 9:1). Two reaction models were obtained, one for the pyrolysis and another for the combustion degradation (N-2:O-2 4:1 and N-2:O-2 9:1), simultaneously correlating the experimental data from the dynamic and dynamic+isothermal runs at different heating rates. The pyrolytic model considered consisted of two consecutive reactions with activation energies of 142 and 217.5 kJ mol(-1) and reaction orders of 0.805 and 1.246. Nevertheless, to simulate the experimental data from the combustion runs, three consecutive reactions were employed with activation energies of 237.9, 103.5 and 120,1 kJ mol(-1), and reaction orders of 2.003, 0.778 and 1.025. From the characterization of the sample employing TG-IR and TG-MS, the results obtained showed that the FPUF, under an inert atmosphere, started the decomposition breaking the urethane bond to produce long chains of ethers which were degraded immediately in the next step. However, under an oxidative atmosphere, at the first step not only the urethane bonds were broken but also some ether polyols started their degradation which finished.at the second step producing a char that was degraded at the last stage. (C) 2015 Elsevier B.V. All rights reserved.