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首页> 外文期刊>Journal of thermal analysis and calorimetry >Heating rate dependence of melting peak temperature examined by DSC of heat flux type
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Heating rate dependence of melting peak temperature examined by DSC of heat flux type

机译：用热通量DSC法测定的熔融峰温度的升温速度依赖性

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摘要

Crystal melting behavior of indium and isotactic polypropylene has been examined by differential scanning calorimetry of heat flux type in terms of the heating rate, , dependence. The melting shows the dependence characterized by a power, , of the shift in peak temperature in proportion to . The power, , differentiates the melting with and without superheating. For polymer crystal melting, intrinsic nature of the broad melting region with a fractional power, , due to superheating of melting kinetics has been reconfirmed experimentally. On the other hand, the crystal melting of indium, which is supposed to proceed with negligible superheating, showed the shift in peak temperature with the power in the range of , depending on sample mass, which is due to instrumental thermal lag predicted by the Mraw's model consisting of lumped elements. The dependence is influenced by the thermal lag determined by the thermal contact resistance between the sample pan and the stage, the effect of which has been examined in terms of the dependence on sample mass and the application of silicone grease between the sample pan and the stage. The influence of two different types of the definition of heat flow has also been examined; the simplified one without the time derivative of temperature difference showed an apparent shift in peak temperature at faster scan rates in a similar way as that of thermal lag.
机译：铟和全同聚丙烯的晶体熔融行为已经通过热通量类型的差示扫描量热法根据加热速率的依赖性进行了研究。熔化显示峰值温度与的比例成正比，以功率为特征。功率区分有无过热情况下的熔化。对于聚合物晶体熔化，由于熔化动力学的过热，已经通过实验证实了具有分数幂的宽熔化区域的固有性质。另一方面，铟的晶体熔化（认为是过热可以忽略不计）显示出峰值温度的变化，其功率范围为，取决于样品质量，这是由于Mraw's预测的仪器热滞后引起的。由集总元素组成的模型。该依赖性受样品盘与样品台之间的热接触电阻确定的热滞后的影响，已根据对样品质量的依赖性以及样品盘与样品台之间的硅脂的施加情况检查了其影响。 。还研究了两种不同类型的热流定义的影响。没有温度差的时间导数的简化曲线显示出以更快的扫描速率出现的峰值温度的明显变化，其方式与热滞后相似。

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