Monnier Xavier, Marina Sara, Lopez de Pariza Xabier, Sardón Haritz, Martin Jaime, Cangialosi Daniele
Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain.
POLYMAT, University of the Basque Country UPV/EHU, Av. de Tolosa 72, 20018 San Sebastián, Spain.
Polymers (Basel). 2021 Mar 20;13(6):954. doi: 10.3390/polym13060954.
The present work aims to provide insights on recent findings indicating the presence of multiple equilibration mechanisms in physical aging of glasses. To this aim, we have investigated a glass forming polyether, poly(1-4 cyclohexane di-methanol) (PCDM), by following the evolution of the enthalpic state during physical aging by fast scanning calorimetry (FSC). The main results of our study indicate that physical aging persists at temperatures way below the glass transition temperature and, in a narrow temperature range, is characterized by a two steps evolution of the enthalpic state. Altogether, our results indicate that the simple old-standing view of physical aging as triggered by the α relaxation does not hold true when aging is carried out deep in the glassy state.
本研究旨在深入探讨近期的研究发现，这些发现表明玻璃态物质在物理老化过程中存在多种平衡机制。为此，我们通过快速扫描量热法（FSC）跟踪物理老化过程中焓态的变化，对一种玻璃形成聚醚——聚（1,4 - 环己烷二甲醇）（PCDM）进行了研究。我们研究的主要结果表明，物理老化在远低于玻璃化转变温度的温度下仍会持续，并且在一个狭窄的温度范围内，其特征是焓态呈现两步演化。总之，我们的结果表明，当在玻璃态深处进行老化时，将物理老化简单地视为由α弛豫引发的传统观点并不成立。
