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.

Critical Compressibility Factors for Chain Molecules

Published

Author(s)

L L. Lue, Daniel G. Friend, J. R. Elliott

Abstract

For many equations of state for fluids composed of chain-like molecules, the compressibility factor is related to the chain number concentration only through the total monomer concentration. For these theories, we find that the critical compressibility factor approaches one-third in the limit of infinitely long chains, contrary to experimental trends. This behavior can be attributed to inaccurate scaling of the virial coefficients of these equations of state with respect to chain length near the critical temperature. Appropriate scaling leads to the proper trend for the compressibility factor, as demonstrated with a simple equation.
Citation
Molecular Physics
Volume
98
Issue
No. 18

Keywords

critical point, equation of state, polymer, scaling behavior

Citation

Lue, L. , Friend, D. and Elliott, J. (2000), Critical Compressibility Factors for Chain Molecules, Molecular Physics (Accessed July 18, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created August 31, 2000, Updated October 12, 2021