ADSORPTION OF CATIONIC POLYSULFONE ON BENTONITE

The adsorption of a polycation (diallyldimethylammonium chloride–SO2 copolymer) on bentonite, a hydrophilic and negatively charged clay, was investigated. The cation exchange capacity of bentonite decreased with the adsorption of polycation. From this fact it may be concluded that the adsorption of the polycation on bentonite proceeds in a cation‐exchange manner. Bentonite came to have some anion‐exchange capacity as a result of adsorption of the polycation. This may be attributed to the existence of the parts in the polymer chain which do not take part in the combination with bentonite. The anion‐exchange capacity increased and the complex became somewhat hydrophilic if a simple salt such as sodium chloride was added to bentonite with the polycation. The polymer was not desorbed from the complex by treatment with NaCl or CaCl2. The adsorption reaction of the polymer on bentonite may be considered to be irreversible. Copyright © 1968 John Wiley & Sons, Inc.