| ΔGmix | Gibbs free energy change of mixing that occurs when a polymer dissolves in the solvent |
| k | Boltzmann constant |
N1, number of solvent molecules
N2, number of polymer segments
v1, volume fraction of the solvent
v2, volume fraction of the polymer χ12, Flory Huggins interaction parameter
The convention is for 1 to designate the solvent and for 2 to designate the polymer (sometimes called the solute).
