玻璃老化运动的双重方面
Valerio Di Lisio1, Lorenzo Augusto Rocchi2, Daniele Cangialosi1,3
1<a href="https://ror.org/02e24yw40">Donostia International Physics Center</a>, Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain.
玻璃型聚合物的衰老不同于以前的想法. 虽然度首先达到平衡,但脱玻璃化宽度表明随着时间的推移越来越多的异质性,这表明眼镜中的复杂衰老动态.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 物理化学 物理化学
背景情况:
- 玻璃聚合物在玻璃过渡温度以下表现出复杂的老化行为.
- 了解玻璃材料的依赖时间的演变对于预测其长期性质至关重要.
- 当前的模型往往侧重于度放松,可能会忽视衰老的其他关键方面.
研究的目的:
- 用先进的热量计来研究玻璃型聚合物的异热衰老动力学.
- 为了比较体状态的衰老与脱宽度的衰老.
- 为了确定单独的度放松是否足够地描述了玻璃材料的时间演变.
主要方法:
- 使用快速扫描热度计 (FSC) 来监测异热衰老动力学.
- 测量玻璃合体状态的时间演变.
- 在加热时监测脱玻璃化宽度的老化动力学 (ΔTdev).
- 在其他类型的眼镜上进行补充测量.
主要成果:
- 发现玻璃度在玻璃过渡温度 (Tg) 下的脱玻璃化宽度之前显著提前达到平衡.
- 脱宽度 (ΔTdev) 在长时间的老化过程中表现出持续的演变,表明异质性日益增加.
- 放松时间的这种差异凸显了玻璃状态内的明显的衰老过程.
结论:
- 玻璃的态状态比其结构异质性更快达到平衡,这是由脱玻璃化宽度表明的.
- 对玻璃材料的时间依赖进化的全面描述需要考虑不仅仅是体状态之外的因素.
- 这些发现表明,眼镜的老化过程比以前建模的更加复杂,多阶段.
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