Abstract
An attempt was made for the micro-porous cellulose and cellulose acetate (CA) membranes prepared by the micro-phase separation method, (1) to evaluate by the electron micrographic (EM) method the pore radius (r) distribution (N(r)) of the hypothetical inner layers of the membranes parallel to and apart from the surface by the distance Z and (2) to explain the morphological characteristics of these membranes by the particle-growth theory presented previously by Kamide and Manabe, taking into consideration the development of the phase separation of the solution during casting process. For this purpose, the cloud point curve and the binodal (the compositions of two coexisting phases at equilibrium) were determined for the cuprammonium solution giving the cellulose membranes. Transport phenomena of ions and non-electrolyte molecules through an interfacial boundary between the casting solution and the coagulating solution were investigated in the process of forming the cellulose membrane. For the cellulose membrane, with an increase in Z, N(r) becomes narrower and the peak value of N(r) increases on shifting the peak position to the smaller r value side. For the CA membrane these dependences on Z are reversed. Variation of N(r) with Z can be reasonably explained by change in the CA concentration in the casting solution with Z. For the cellulose membrane, water molecules in the casting solution are transported to the coagulation solution, resulting in an increase in the polymer concentration.
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Manabe, SI., Kamata, Y., Iijima, H. et al. Some Morphological Characteristics of Porous Polymeric Membranes Prepared by “Micro-Phase Separation Method”. Polym J 19, 391–404 (1987). https://doi.org/10.1295/polymj.19.391
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DOI: https://doi.org/10.1295/polymj.19.391
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