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Does the entropy and volume dependence of the structural a-relaxation originate from the Johari-Goldstein β-relaxation?

机译:结构a松弛的熵和体积依赖性是否源自Johari-Goldsteinβ松弛?

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摘要

Conventional theories of glass transition are focussed on reproducing the thermodynamic and dynamic properties of the structural α-process. However, in the last decade a class of secondary relaxations, called the Johari-Goldstein (JG) β-relaxations, has attracted attention in view of the existence of various corre_lations and similarities of its properties with the structural α-process. These experimental evidences sug_gest that the secondary process may play a fundamental role in glass transition, and any theory of glass transition would be incomplete until the inter-relations between the JG β-relaxation and the structural relaxation have been considered. In this paper, some significant experimental results showing several general and nontrivial connections between structural relaxation and JG β-relaxation are reported. In par_ticular, these connections indicate that, like the structural relaxation, the JG β-relaxation is entropy and volume dependent. The experimental facts are consistent with the results of the coupling model.
机译:传统的玻璃化转变理论集中在再现结构α过程的热力学和动力学特性上。然而,在过去的十年中,由于存在各种相关性以及其性质与结构α过程的相似性,一类称为Johari-Goldstein(JG)β松弛的二次弛豫引起了人们的关注。这些实验证据表明,次级过程可能在玻璃化转变中起着根本性的作用,在考虑到JGβ松弛与结构弛豫之间的相互关系之前,任何玻璃化转变的理论都是不完整的。本文报道了一些重要的实验结果,这些结果表明了结构弛豫与JGβ松弛之间的一些一般性和非重要的联系。特别地,这些联系表明,像结构弛豫一样,JGβ弛豫与熵和体积有关。实验事实与耦合模型的结果一致。

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