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OALib Journal期刊
ISSN: 2333-9721
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软质聚氨酯泡沫阴燃前热解特性及动力学分析
DOI: 10.3969/j.issn.1671-7627.2014.05.020, PP. 112-117
Keywords: 软质聚氨酯泡沫,阴燃,o2浓度,热解动力学,活化能
Abstract:
采用差示扫描量热-热重分析(dsc-tga)同步热分析仪和中温差热分析仪(dta)对软质聚氨酯泡沫(fpuf)在不同o2浓度下的热解特性、热解动力学及其对阴燃的影响进行研究。结果表明:聚氨酯泡沫热解主要分为2个阶段。第一阶段主要是fpuf分解产生异氰酸酯和多元醇,第二阶段主要为多元醇的分解。当o2体积分数从0增加到50%时,第一阶段热解起始温度和活化能变化很小,第二阶段最大质量分数损失速率对应温度从385℃降低到300℃,活化能从170kj/mo1降低到80kj/mo1。聚氨酯热解过程中不同类型反应的活化能大小顺序为:多元醇热解活化能>聚氨酯热解活化能>多元醇氧化活化能。多元醇氧化反应产生的热量是聚氨酯泡沫阴燃时的主要热量来源。因此,o2浓度增加通过加快热解速率、降低反应所需温度和增加放热量来促进阴燃的建立和传播。
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