oa South African Journal of Chemical Engineering - Phase separation in multicomponent polymer - solvent - nonsolvent coatings
Simulation study for drying induced phase separation has been done in cellulose acetate - water - acetone system. Effects of drying condition, nonsolvent and solvent concentrations have been studied. Simulation results show that porous asymmetric and symmetric membranes can be produced by changing the nonsolvent concentration or by the drying conditions without altering the polymer content using dry-casting process. At low initial nonsolvent concentration, phase separation may not take place and dense polymer film may be obtained rather than a porous membrane.
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