玻璃化转变是非晶高聚物的重要现象之一 ,如何比较不同测量手段所得的结果 ,已成为玻璃化转变的一个公开问题 .研究了降温速率对聚甲基丙烯酸甲酯动态力学行为的影响 .结果表明 :在缓慢降温的测量条件下 ,降温速率并不影响α内耗峰的峰温Tα.由此可推断 ,即使在低频测量时 ,Tα 和用示差扫描量热法测得的玻璃化转变温度Tg 在数值上相差不大 ,但是这两个温度在本质上是不同的 :Tα 几乎不依赖于降温速率 (至少在缓慢降温的情况下 ) ,而Tg 具有强烈的降温速率依赖性 .最后尝试研究了快速降温条件下聚甲基丙烯酯的动态力学行为 Glass transition is one of the most important phenomena of amorphous polymers, and how to compare the results obtained by different measurement methods has become a public issue of glass transition, and the effect of cooling rate on the dynamic mechanical behavior of polymethylmethacrylate has been studied. The results show that the cooling rate does not affect the peak temperature Tα of the internal peak of α under the measurement conditions of slow cooling.Thus it can be inferred that Tα and the glass transition temperature measured by differential scanning calorimetry Tg is not very different in magnitude, but the two temperatures are essentially different: Tα hardly depends on the cooling rate (at least in the case of a slow cooling), whereas Tg has a strong cooling rate dependence.Finally, Dynamic Mechanical Behavior of Poly (Propyl Methacrylate) under Rapid Cooling