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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >PHASE ANGLE CORRECTION FOR TMDSC IN THE GLASS-TRANSITION REGION
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PHASE ANGLE CORRECTION FOR TMDSC IN THE GLASS-TRANSITION REGION

机译：玻璃化转变区TMDSC的相角校正

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摘要

Temperature-modulated DSC (TMDSC) allows the determination of frequency (time) dependent heat capacities. If heat capacity is frequency dependent, for example, in the glass-transition region, one get a phase angle between heating rate and heat-flow rate which is related to material intrinsic properties. Because heat does not propagate but flows, the time-consuming heat transfer into the sample yields an additional phase angle. This phase angle has to be taken into account if one wants to calculate the imaginary part of the complex heat capacity of the sample from the measured phase angle. The heat transfer related phase angle depends on frequency heat capacity and heat conductance. In the case of glass-transition, heat capacity and heat conductance may change in the respective temperature interval. A correction for the corresponding phase angle is suggested. (C) 1997 Elsevier Science B.V. [References: 38]
机译：温度调制DSC（TMDSC）允许确定与频率（时间）相关的热容量。如果热容量是频率相关的，例如在玻璃化转变区域中，人们会得到与材料固有特性有关的加热速率和热流量之间的相角。由于热量不传播而是流动，因此耗时的热量传递到样品中会产生附加的相角。如果要从测量的相位角计算出样品的复热容量的虚部，则必须考虑该相位角。与传热有关的相角取决于频率的热容量和热导率。在玻璃化转变的情况下，热容量和热导率可能会在各自的温度区间内发生变化。建议对相应的相角进行校正。 （C）1997 Elsevier Science B.V. [参考：38]

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