Flory-Huggins theory of concentrated solutions

The phase behavior of a two-component soluhon depends on the chemical potenhals of the solvent and the solute. While it would be very difficult to 

The Gibbs energy of mixing, AG JT,N, N2), can be divided into an entropy of mixing and an enthalpy of mixing. For a random mixture, the entropy of mixing was shown by Floryi to be given by  

Since the enthalpy of mixing contains two unknown parameters that always appear as a product, it is convenient to define a quantity that will appear constantly in the theory anyway  

The Flory % parameter has foimd widespread use in the discussion of any two-component mixture, including polymer mixtures. The Gibbs energy of mixing can then be written as  

The Flory-Huggins expression for the Gibbs energy of mixing allows a calculation of the chemical potential of the solvent  

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