Martinez-Garcia Julio Cesar, Rzoska Sylwester J, Drozd-Rzoska Aleksandra, Starzonek Szymon, Mauro John C
Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, Berne CH-3012, Switzerland.
1] Institute of High Pressure Physics Polish Academy of Sciences, ul. Sokołowska 27/39, 01-142 Warsaw, Poland [2] Institute of Physics &ŚMCEBI, University of Silesia, ul. 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland.
Sci Rep. 2015 Feb 9;5:8314. doi: 10.1038/srep08314.
The concept of 'fragility' constitutes a central point of the glass transition science serving as the 'universal' metric linking previtreous dynamics of qualitatively distinct systems. Finding the fundamental meaning of fragility is the 'condicio sine qua' for reaching the long expected conceptual breakthrough in this domain. This report shows that fragility is determined by the ratio between two fundamental process energies, viz. the activation enthalpy and activation energy. The reasoning, avoiding any underlying physical model, is supported by the experimental evidence ranging from low molecular weight liquids and polymers to plastic crystals and liquid crystals. All these lead to the new general scaling plot for dynamics of arbitrary glass former. The limited adequacy of broadly used so far semi-empirical relationships between fragility and the activation energy is shown. Results presented remain valid for an arbitrary complex system and collective phenomena if their dynamics is described by the general super-Arrhenius relation.
“脆性”概念是玻璃化转变科学的核心要点，它作为一种“通用”度量，将性质不同的系统的玻璃态前动力学联系起来。找到脆性的基本含义是在该领域取得长期期待的概念突破的“必要条件”。本报告表明，脆性由两个基本过程能量之比决定，即活化焓和活化能。该推理过程不依赖任何潜在物理模型，并得到了从低分子量液体、聚合物到塑性晶体和液晶等一系列实验证据的支持。所有这些都导出了任意玻璃形成体动力学的新通用标度图。结果表明，迄今为止广泛使用的脆性与活化能之间的半经验关系存在一定局限性。如果任意复杂系统及其集体现象的动力学由一般的超阿累尼乌斯关系描述，那么本文给出的结果仍然有效。
