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The thermally induced phase separation (TIPS) process is a valuable way of making microporous materials, such as membranes and foams. TIPS process consists of the following steps.1. A homogeneous solution is formed at an elevated temperature by blending the polymer with a high-boiling, low molecular weight liquid (diluent).2. The solution is formed into the desired shape (flat sheet, tube, hollow fiber).3. The solution is cooled at a controlled rate or quenched to induce phase separation.4. The diluent is removed typically by solvent extraction.5. The extracatnt is removed typically by evaporation to produce a microporous structure.This paper mainly focuses on the kinetics of phase separation in the TIPS process. The studies on phase separation by the light scattering method, kinetics of droplet growth in the latter stage of phase separation and the computer simulation on dynamics of spinodal decomposition are reviewed briefly. Accurate engineering of the TIPS process is essential for control of microstructural properties such as pore size, pore size distribution and porosity, since these properties ultimately determine the performance of the microporous membranes.

Structure Control of Porous Membrane Prepared by Thermally Induced Phase Separation.