Centro de de Física de Materiales (MPC), Centro Mixto CSIC-UPV/EHU, Paseo Manuel Lardizabal 5, 20018 San Sebastián, Spain.
Departamento de Polímeros y Materiales Avanzados UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain.
J Chem Phys. 2023 May 7;158(17). doi: 10.1063/5.0145433.
The non-exponential character of the structural relaxation is considered one of the hallmarks of the glassy dynamics, and in this context, the relatively narrow shape observed by dielectric techniques for polar glass formers has attracted the attention of the community for long time. This work addresses the phenomenology and role of specific non-covalent interactions in the structural relaxation of glass-forming liquids by the study of polar tributyl phosphate. We show that dipole interactions can couple to shear stress and modify the flow behavior, preventing the occurrence of the simple liquid behavior. We discuss our findings in the general framework of glassy dynamics and the role of intermolecular interactions.
结构弛豫的非指数特征被认为是玻璃动力学的特征之一，在这方面，介电技术观察到的极性玻璃形成物相对较窄的形状长期以来一直引起了人们的关注。这项工作通过研究极性磷酸三丁酯来研究特定非共价相互作用在玻璃形成液体结构弛豫中的现象学和作用。我们表明，偶极相互作用可以与剪切应力耦合并改变流动行为，从而阻止简单液体行为的发生。我们在玻璃动力学的一般框架内讨论了我们的发现以及分子间相互作用的作用。
