k, Boltzman's constant
R, Real Gas Law constant
T, temperature
N1, number of the solvent molecules
n1, number of the moles of solvent
v2, volume fraction of polymer
χ12, Flory interaction parameter
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A positive χ12 indicates the enthalpy does not favor dissolution.
- If the Gibbs Free Energy of change is positive, dissolution will not occur.
- If the Gibbs Free energy of cyange is negative, dissolution will occur.
A derivation is available that begins with interaction energies and then becomes a formula that, when the Flory interaction parameter is put into it, the result is the enthalpy listed above (enthalpy with kT).
See also:
