Polymer Free Volume and Its Connection to the Glass Transition
By Ronald P. White, J. Lipson. 2016
448 citations recorded by the source corpus.
In this Perspective we summarize the most widely used definitions of free volume and illustrate the differences between them, including the important distinction between total free volume and excess free volume. We discuss the implications when alternative estimates for free volume are inserted into relationships that connect experimentally measured properties (e.g., the viscosity) to free volume, such as those proposed by Doolittle, Fox and Flory, Simha and Boyer, Cohen and Turnbull, and Williams, Landel, and Ferry. Turning to the results of our own locally correlated lattice (LCL) model, we demonstrate, by analyzing data for a set of over 50 polymers, that our calculations for total percent free volume not only lead to a predictive relationship with experimental glass transition temperatures but also allow us to place the different definitions of free volume within a physical picture of what the proposed contributions represent. We find that melts go glassy upon reaching a “boundary” of minimum (total) ...
Subfields: Biomedical Engineering, Condensed Matter Physics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/05019495d28cd58f40bc06fa56b64fe59e2dabe7
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In Biomedical Engineering
Citations in the corpus
- Predicting the glass transition temperature and viscosity of secondary organic material using molecular composition (2017, background): “…between Tg and the number of carbon atoms is consistent with the free volume theory, in which molecular motion is restricted by the difference between the space required for a molecule to vibrate versus the space in which the molecule resides (i.e., the free volume; White and Lipson, 2016).”