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Thermodynamics of Formation of Porous Polymeric Membrane from Solutions

In order to give better and quantitative understanding of the pore forming mechanism in the solvent casting method, a theory was presented as an example of the application of phase equilibrium. Mechanism of formation of critical nucleus from homogeneous polymer solution in the metastable region of the phase diagram was investigated in accordance with the activation energy of nucleation. The growth rate of nucleus by diffusion to the primary particle and the time of attainment of phase equilibria of whole system were determined under the assumption of local equilibrium between nucleus and sorrounding sphere. Formation of secondary particle by amalgamation was tried to explain by use of the particle Monte–Carlo simulation approach.