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Calorimetric versus kinetic glass transitions in viscous monohydroxy alcohols

机译:粘性一羟基醇的量热与动态玻璃化转变

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An extensive. comparison of calorimetric and dielectric measurements is carried out for generic molecular liquids and monohydroxy alcohols with focus on the identification of the dielectric modes which are associated with the glass transition. For generic liquids, the calorimetric glass transition temperatures (Tg-cal) are always greater than their kinetic counterparts (Tg-kin), but the difference remains below 3 K. Also, the nonexponentiality parameters of the Tool-Narayanaswamy-Moynihan-Hodge model applied to the calorimetric data and the stretching exponents of the dielectric measurements show remarkable agreement. The same behavior is found for glass-forming monohydroxy alcohols, provided that the faster and smaller non-Debye relaxation rather than the large dielectric Debye process is assigned to the structural relaxation. The study emphasizes that the dielectric signature of the glass transition in monohydroxy alcohols is a dispersive loss peak that is faster and significantly smaller than the prominent Debye feature. (c) 2008 American Institute of Physics.
机译:广泛的。对通用分子液体和单羟基醇进行了量热和介电测量的比较,重点是与玻璃化转变有关的介电模式的识别。对于普通液体,量热玻璃化转变温度(Tg-cal)始终高于其动态对应温度(Tg-kin),但差异仍低于3K。此外,Tool-Narayanaswamy-Moynihan-Hodge模型的非指数参数应用于量热数据和介电测量的拉伸指数显示出显着的一致性。对于形成玻璃的单羟基醇,只要将更快,更小的非德拜弛豫而不是大介电德拜过程指定给结构弛豫,就会发现相同的行为。该研究强调,在单羟基醇中玻璃化转变的介电特征是一个分散损耗峰,它比显着的德拜特征更快且明显更小。 (c)2008年美国物理研究所。

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