Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Fragility of Glass-Forming Polymer Liquids

Published

Author(s)

J Dudowicz, Karl Freed, Jack F. Douglas

Abstract

Many fluids exhibiting complex molecular structure or interactions solidify by glass-formation rather than crystallization. This tendency is especially prevalent in polymeric and biological systems where glass-formation is normal rather than exceptional. Glass-formation involves a continuous 14 order of magnitude viscosity increase upon cooling, while crystallization is accompanied by an abrupt juimp to infinite values.The mechanical and transport properties of glasses are largely dictated by thr rate at which the viscosity changes with temperature ('fargility'), and an elucidation of the molecular and thermodynamic factors that influence fragility is crucial for engineering the properties of polymer materials and for designing processes for preserving biological materials.The present paper develops a systematic desription of fragility for general classes of polymer fluids based on direct lattice model computations of the configurational entropy S in combination with the Adam-Gibbs theory of structural relaxation.
Citation
Journal of Physical Chemistry B
Volume
109

Keywords

configurational enthropy, fragility, glass-formation, monomer structure, pressure-induced glass-formation

Citation

Dudowicz, J. , Freed, K. and Douglas, J. (2005), Fragility of Glass-Forming Polymer Liquids, Journal of Physical Chemistry B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852482 (Accessed April 13, 2024)
Created October 3, 2005, Updated October 12, 2021