Abstract
The surface concentration of polymer molecules in solution has been combined with the three-component bulk-phase diagram of Strathmann et al. to describe the complete equilibrium thermodynamic precasting situation. The polymer surface concentration is estimated according to the theory of Prigogine and Marechal as used by Siow and Patterson, and is governed by the relative values of the polymer and solvent surface tension, γp and γs respectively. In general, when γp > γs, the cast membrane will tend to form with the asymmetric layer on the support side; for γp γp at the gel transition point.
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