Characterization of the Flory-Huggins interaction parameter of polymer thermodynamics
Materials Research and Innovation Laboratory, Department of Chemical and Biomolecular Engineering, University of Tennessee - Knoxville, TN 37996, USA
Received: 8 September 2014
Accepted: 8 December 2014
Flory-Huggins theory is the main basis of polymer solution and blend thermodynamics. A key piece of this theory is a parameter quantifying the enthalpic interactions between the components; however, experiments have revealed that this parameter is not composition independent, as originally assumed. This composition dependence has been attributed by some theorists to experimental error; others have tried to explain it based on several competing hypotheses. Here, we use atomistic simulations of isotopic blends based on realistic potentials to study this parameter without making any prior hypotheses. Simulations reveal a composition dependence of this parameter that compares well with experimental data, and serve to verify theoretical relationships between the various forms of this parameter.
PACS: 65.20.De – General theory of thermodynamic properties of liquids, including computer simulation / 64.10.+h – General theory of equations of state and phase equilibria / 82.35.Lr – Physical properties of polymers
© EPLA, 2014