试样越多，峰顶温度向高温方向偏移，但外推起始温度不变；
The more sample is the more the peak temperature deviates to high temperature, but extrapolated onset temperature is constant.
结果表明由于热稳定剂的加入，使PU的外推起始分解温度和最大分解温度推迟，放热速度减慢。
The results obtained shown that the initial decomposing temperature and maximum decomposing temperature of PU are postponed and the exothermic rate is retarded with adding the thermal stabilizer.
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