can be approximated to leading order:

Evaluating the entropy:

The last two terms are constant and negligible and do not affect the system.

Rewriting the dimensionless free energy of the mixture:

While the monomer solution is symmetric to the exchange , the polymer solution is not. This is due to the fact that the entropy in polymer solutions is lower than in monomer solutions, since the monomers in each polymer must be connected to one another. Thus, a change in the concentration, even if symmetric, will change

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