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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effects of thermal history on enthalpy relaxation in glasses 7. Thermal time constants
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Effects of thermal history on enthalpy relaxation in glasses 7. Thermal time constants

机译：热历史对玻璃焓变的影响7.热时间常数

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摘要

Experimental data on a single polymer sample indicate that the instrumental/sample Green function is essentially a Dirac delta function, with a time constant of 15 s. Distortions of scanned heat capacities over the glass transition temperature range, induced by this Green function, were deconvoluted and the deconvoluted data were found to be independent of heating = cooling rate (apart from temperature shifts), in accordance with expectations. The effects of a single thermal time constant on computed activation energies and different definitions of T_g are discussed. It is suggested that temperature calibration can be compromised by a nonzero thermal time constant.
机译：单个聚合物样品的实验数据表明，仪器/样品的Green函数本质上是Dirac delta函数，时间常数为15 s。根据期望，对由该格林函数引起的在玻璃化转变温度范围内扫描的热容量的失真进行了反卷积，发现该经卷积的数据与加热=冷却速率（除温度变化）无关。讨论了单个热时间常数对计算出的活化能的影响以及T_g的不同定义。建议通过非零的热时间常数来破坏温度校准。

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