Flory–Huggins Theory

A mean‑field lattice model for the thermodynamics of polymer solutions and mixtures that expresses the free energy of mixing per lattice site as ΔG_mix/kT = φ_1 lnφ_1 + φ_2/N lnφ_2 + χ φ_1 φ_2 (with polymer degree of polymerization N and interaction parameter χ), predicting miscibility and spinodal/ binodal behavior under assumptions of an incompressible lattice, random mixing, and negligible spec