聚合物
玻璃化转变
焓
材料科学
体积热力学
膜
热力学
高分子化学
化学物理
高分子科学
复合材料
化学
物理
生物化学
作者
Melanie M. Merrick,Rahul Sujanani,Benny D. Freeman
出处
期刊:Polymer
[Elsevier]
日期:2020-12-01
卷期号:211: 123176-123176
被引量:31
标识
DOI:10.1016/j.polymer.2020.123176
摘要
Polymers below their glass transition temperature (Tg) are non-equilibrium glasses because excess free volume “frozen” between kinetically-restricted polymer chains slowly relaxes over time towards equilibrium via local, segmental chain motion. This process, known as physical aging, is observed through time-dependent decreases in a polymer's specific volume, enthalpy, etc. This article focuses on the history of glassy polymers in membrane separation applications. Open questions regarding the influence of thickness (e.g., membrane geometry) and temperature on physical aging in glassy polymers are highlighted.
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