Lattice Model Treatments of the Formation of Ordered Phases in Stiff Chain Polymer-Diluent Systems

  • Elizabeth L. Wee
  • Wilmer G. Miller


The Flory-Huggins lattice treatment has been the cornerstone for many years for understanding the solution thermodynamics of flexible polymers. The effect of chain stiffness was investigated by Flory, again using a lattice approach,1,2 where the stability of both ordered and disordered phases was considered. The phase equilibria for a rigid rod-diluent system, plotted as the volume fraction vi, are shown in Figure 1 for a rod of 150 axial ratio, where χ is the van Laar polymer-solvent heat of mixing parameter. Alternatively, χ may be looked upon as proportional to the excess free energy of mixing.


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Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • Elizabeth L. Wee
    • 1
  • Wilmer G. Miller
    • 1
  1. 1.Department of ChemistryUniversity of MinnesotaMinneapolisUSA

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