A segment-based local composition model for the gibbs energy of polymer solutions

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Abstract

A segment-based local composition model is presented for the Gibbs energy of polymer solutions. The model represents a synergistic combination of the Flory-Huggins description for the configurational entropy of mixing molecules of different sizes and the Non-Random Two Liquid (NRTL) theory for the local composition contribution from mixing solvents and polymer segments. It reduces to the well-known NRTL equation if polymers are removed from the system. The model provides a most flexible thennodynamic framework to correlate the phase behavior of polymer solutions. The utility of the model was demonstrated with successful representation of vapor-liquid equilibrium and liquid-liquid equilibrium of single solvent, single polymer systems.

Original languageEnglish
Pages (from-to)301-312
Number of pages12
JournalFluid Phase Equilibria
Volume83
Issue numberC
DOIs
StatePublished - Feb 1993

Keywords

  • excess functions
  • liquid-liquid equilibrium
  • polymers
  • theory
  • vapor-liquid equilibrium

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