Abstract
In order to prepare charge-mosaic membranes, many attempts have been made by many authors. In this article a historical survey is presented on the development of the methods for fablicating such membranes. A multiblock copolymer method is considered to be one of the most promising methods. Suitably designed ISIAI-type pentablock copolymers consisting of isoprene (I), styrene (S), and 4-vinylbenzyldimethylamine (A) with a three-layer-lamellar structure are stable to chemical treatments and successfully give a charge-mosaic membrane which shows a piezodialytic effect and a very high salt permeability. This membrane is useful for desalination of aqueous solutions containing organic substances of low molecular weights.
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