Development for Charged Mosaic Composite Membranes Possessing Selective Separation of Amino Acids

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A template pattern with alternating poly (4-vinylpyridine) (P4VP) /poly (vinyl alcohol) (PVA) lamellae was fabricated upon a microporous poly (vinyl chloride) (PVC) membrane by casting of poly [4-vinylpyridine (4VP) -g-vinyl alcohol (VA)] graft copolymer. After a treatment of both binding of microporous membrane with graft copolymer and domain fixing of the PVA matrix, a dilute solution of poly [acrylic acid (AA) -benzyl N,N-diomethyldi-thiocarbamate (DMTC)] /P4VP or poly [sodium p-stirenesulfonate (SSS) -DMTC] /P4VP binary blend was cast on this template surface. Two types of weak acid/strong base or strong acid/strong base microdomains formed by epitaxial growth were oriented perpendicularly to the membrane surface. After the chemical treatments : introduction of the charge and domain fixing of ion exchange regions, two types of such mosaic microdomains could be constructed on a microporous membrane. We studied the transport behaviors of organic and inorganic solutes through charged mosaic composite membranes. The permeability of inorganic electrolyte, such as Kcl was about 20-fold compared to those of organic nonelectrolytes, such as glucose and sucrose.L-Phenylalanine exhibits a low value of permeability at the pH of its isoelectric point.