Precise glass temperatures
Precise glass temperatures
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DOI：
10.1088/0953-8984/15/11/304
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发表时间：
2003-03
期刊：
影响因子：
--
通讯作者：
D. Plazek;C. Bero
中科院分区：
文献类型：
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作者：
D. Plazek;C. Bero
由于玻璃温度Tg是非晶态材料的相应温度，如果测量得当，需要精确的数值。当从平衡冷却进行测定时，得到了材料的特征值。大多数报道的值是在加热实验中获得的，该实验产生的特定于样品的值近似于虚构的温度Tf。给出了在Tg处的松弛时间的结果差异的例子。在冷却过程中得到的结果表明，对于所考察的所有非晶态材料，局域分子运动在Tg处的迁移率可能是相同的。此外，从可恢复柔度可以得到相对精确的Tg值。
Since the glass temperature Tg is a corresponding temperature for amorphous materials, if measured properly, precise values are needed. When determinations are made by cooling from equilibrium, material characterizing values are obtained. Most reported values are obtained in heating experiments which yield specimen-specific values, which approximate fictive temperatures Tf. Examples of consequent discrepancies of relaxation times at Tg are given. Results obtained in cooling show that it is likely that the mobility at Tg of local molecular motions is the same for all of the amorphous materials examined. In addition, it is shown that relatively precise values of Tg can be obtained from the recoverable compliance.