A New Charge-Mosaic Membrane from a Multiblock Copolymer
TERUO FUJIMOTO 1,
KOJI OHKOSHI 1,
YOSHIYUKI MIYAKI 2, and
MITSURU NAGASAWA 3
1 Department of Materials Science and Technology, Technological University of Nagaoka, Kamitomioka-cho, Nagaoka 949-54, Japan
2 Central Research Laboratory, Toyo Soda Manufacturing Company, Shin-Nanyo, Yamaguchi 746, Japan
3 Department of Synthetic Chemistry, Nagoya University, Chikusa-ku, Nagoya 464, Japan
A charge-mosaic membrane was prepared from a pentablock copolymer of the BABCB type by selectively introducing anion and cation exchange groups into the microseparated phases. The three-layer lamellar structure of the starting pentablock copolymer film was not disturbed by the modifications. The membrane obtained was highly permeable only to sodium chloride in mixed aqueous solutions of sodium chloride and organic species of low molecular weight, such as sucrose. Marked pH-dependent permeabilities were also observed for amino acids.
Submitted on October 18, 1983
Accepted on January 30, 1984
