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arXiv 1809.06138cond-mat.soft
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超低温玻璃形成系统表观脆性的普遍行为

Universal behavior of the apparent fragility in ultraslow glass forming systems

Aleksandra Drozd-Rzoska

摘要:

尽管对玻璃化转变的大问题进行了数十年的研究,但定义明确的普遍模式的问题,包括主要(结构)弛豫时间的前玻璃体行为的关键问题,仍然难以捉摸。该报告显示了表观脆性的普遍前玻璃体行为,即陡度指数。这表明,对于和。基于这一发现,新的3-参数依赖描绘的玻璃体前的行为的主要弛豫时间已被导出:。所获得的关系的普遍性证明了属于低分子量液体,聚合物(熔体和固体),塑料晶体,液晶,树脂和松弛剂的玻璃形成。他们表现出明确的偏好,无论是VFT或类似的关键描述,如果召回已经使用的建模。新的关系可以服从甚至高于动态交叉温度,与功率指数范围之间的~17(液晶)至~ 57(甘油),这可能表明对称性的影响的previtous效果。最后,出现的相似性在各向同性相的液晶液晶的行为被召回。

英文摘要:

Despite decades of studies on the grand problem of the glass transition the question of well-defined universal patterns, including the key problem of the previtreous behavior of the primary (structural) relaxation time, remains elusive. This report shows the universal previtreous behavior of the apparent fragility, i.e. the steepness index . It is evidenced that , for and . Basing on this finding, the new 3-parameter dependence for portraying the previtreous behavior of the primary relaxation time has been derived: . The universality of obtained relations is evidenced for glass formers belonging to low molecular weight liquids, polymers (melt and solid), plastic crystals, liquid crystals, resins and relaxors. They exhibit clear preferences either for the VFT or for the critical-like descriptions, if recalled already used modeling. The novel relation can obey even above the dynamic crossover temperature, with the power exponent ranging between ~17 (liquid crystals) to ~ 57 (glycerol), what may indicate the impact of symmetry on the previtreous effect. Finally, the emerging similarity to the behavior in the isotropic phase of nematic liquid crystals is recalled.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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