中文摘要：

运用热重-差热-红外-质谱联用（TG-DSC-IR-MS）技术研究了聚氨基甲酸酯（PU）在空气气氛下的热解特性。研究表明,PU在空气环境中热解主要有两个阶段,都属于放热过程。增大升温速率,热解向高温区移动,最大热解速率对应的峰值温度相应提高。PU热解过程首先是聚合物高分子长链断裂生成较短的链,之后氧气参与反应,主要分解产物有二氧化碳、水、碳和胺类、炔类、醇类、醛类物质。运用Ozawa-Flynn-Wall等转化率法求得活化能随转化率的关系曲线,得到活化能的平均值为152.9kJ/mol。

英文摘要：

The thermal decomposition characteristics of polyurethane（PU） in air enviromnent is studied by TG- DSC -IR -MS coupling technique method. The thermal analysis research indicated that there are two main weight loss processes during the thermal decomposition of polyurethane. With increasing heating rates, the initial and external temperature increases, and the maximum thermal decomposition rate corresponding to the peak temperature shiftes to a higher reaction temperature. When polyurethane is heated, the long chains break to shorter chains first, and then the shorter chains react with oxygen. The main products from the thermal decomposition of polyurethane in air are CO2, C, amines, alkynes, alcohols, aldehydes. By Ozawa - Flynn - Wall method, the average activation energy of polyurethane is 152.9kJ· mol^-1.