Abstract
A new path integral method is proposed for treatment of the liquid-gas phase transition in polymer solutions. The Flory-Huggins polymer lattice gas approximation is obtained as a saddle point approximation to the constructed path integral. Study of the one loop corrections to the saddle point results indicates that, irrespective of the polymer length, the liquid-gas transition for polymers belongs to the Ising-model universality class characteristic for simple fluids. This conclusion is in excellent agreement with available experimental data.
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