Conclusions
Studies under the scanning electron microscope have shown that the cellulose acetate membranes used for reverse osmosis are high-molecular-weight condensation structures of the cellular type resulting from the dropwise separation of a new liquid phase under diffusional enrichment of the polymer solution by water, the solvent. The pore diameter, and the total pore volume, both diminish on approaching the membrane surface; the diffuse character of the active layer traces back to the concentration distribution resulting from vaporization of acetone, the volatile component, from the acetone- formamide cellulose acetate solution.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 111–115, January, 1977.
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Vlodavets, I.N., Nefedova, G.Z., Kozhevnikova, N.E. et al. Structures of cellulose acetate membranes for reverse osmosis. Russ Chem Bull 26, 94–98 (1977). https://doi.org/10.1007/BF00921501
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DOI: https://doi.org/10.1007/BF00921501