Abstract
The dynamics of polymeric and other glass-forming liquids dramatically slows down upon cooling toward the glass transition temperature without any obvious significant change in their static structure. A quantitative understanding of this extraordinary dynamic slowdown remains one of the most significant challenges in condensed matter physics. Historically, extensive efforts have been devoted to explaining the dynamics of glass-forming liquids in terms of thermodynamic properties, leading to a number of semi-empirical models emphasizing distinct thermodynamic properties. Here, a thermodynamic perspective is provided on the glass formation of polymeric and other materials. We begin with an overview of the thermodynamic models of glass formation, including the intuitively appealing “free volume” models, enthalpy models originally emphasized by Goldstein and later by others, and the highly influential configurational entropy-based models. The review of these models is followed by a discussion of the advances that attempt to bring together some of the seemingly disparate thermodynamic viewpoints on glass formation by revealing a close interrelation between thermodynamic properties. We conclude this review with remarks on several key topics in this field, along with our viewpoint for future work.
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Acknowledgments
W.S.X. acknowledges the support from the National Natural Science Foundation of China (Nos. 22222307 and 21973089). Z.Y.S. acknowledges the support from the National Natural Science Foundation of China (Nos. 21833008 and 52293471) and the National Key R&D Program of China (No. 2022YFB3707303). The authors are grateful to Dr. Jack F. Douglas for a critical reading of the manuscript. Z.Y.S. thanks Professor Li-Jia An for helpful discussions on glass formation over the years. W.S.X. thanks Dr. Jack F. Douglas for the long-term collaborations and Professor Karl F. Freed for numerous discussions on polymer thermodynamics and glass formation over the years. W.S.X. also thanks Professors Li-Jia An and Zhao-Yan Sun for their support and encouragement at every stage of his academic career.
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Wen-Sheng Xu received his Ph.D. degree from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences in 2012. From 2013 to 2018, he was a postdoctoral scholar first with Professor Karl F. Freed at the University of Chicago and then with Dr. Yangyang Wang at Oak Ridge National Laboratory. He is currently a professor in the State Key Laboratory of Polymer Physics and Chemistry at Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, where he has been a faculty member since 2019. His research group utilizes theoretical methods and computer simulations to investigate the dynamics of noncrystalline polymer materials.
Zhao-Yan Sun received her Ph.D. degree from Jilin University in 2001. She was a postdoctoral fellow at University of Dortmund from 2001 to 2002. Since 2003, she has been a faculty member in the State Key Laboratory of Polymer Physics and Chemistry at Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, initially as an assistant professor and then an associate professor, before becoming a full professor in 2010. She was awarded the Young Chemistry Award of the Chinese Chemical Society in 2005. Her research group focuses on the structure and dynamics of polymers and nanocomposites and the development of computer simulation methods.
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Xu, WS., Sun, ZY. A Thermodynamic Perspective on Polymer Glass Formation. Chin J Polym Sci 41, 1329–1341 (2023). https://doi.org/10.1007/s10118-023-2951-1
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DOI: https://doi.org/10.1007/s10118-023-2951-1