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We investigate local phase transitions of the solvent in the neighborhood ofa solvophobic polymer chain which is induced by a change of the polymer-solventrepulsion and the solvent pressure in the bulk solution. We describe thepolymer in solution by the Edwards model, where the conditional partitionfunction of the polymer chain at a fixed radius of gyration is described by amean-field theory. The contributions of the polymer-solvent and thesolvent-solvent interactions to the total free energy are described within themean-field approximation. We obtain the total free energy of the solution as afunction of the radius of gyration and the average solvent number densitywithin the gyration volume. The resulting system of coupled equations is solvedvarying the polymer-solvent repulsion strength at high solvent pressure in thebulk. We show that the coil-globule (globule-coil) transition occursaccompanied by a local solvent evaporation (condensation) within the gyrationvolume

The local phase transitions of the solvent in the neighborhood of a solvophobic polymer at high pressures