Abstract

Composite membranes of two types, layer-type and sandwich-type, have been prepared from 2% collodion solutions containing different amounts of polystyrene sulfonic acid. The layer-type membranes were formed by evaporating first a collodion solution containing the least amount of the polyelectrolyte. On top of this collodion solutions containing increasing quantities of the poly-electrolyte were evaporated one after the other. Sandwich-type membranes were formed by trapping some polyelectrolyte between two simple membranes, one containing a small quantity and the other containing a large quantity of the polyelectrolyte.

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