Abstract
The deformation of neutral super-cross-linked polystyrene sorbents and ionites based on styrene- divinylbenzene gel-type copolymers brought in contact with concentrated solutions of HCl, H 3 PO 4 , NaOH, NH 4 Cl, (NH 4 ) 2 SO 4 , and LiCl electrolytes was studied by dilatometry for separate spherical granules. Consid- erable contraction of super-cross-linked polystyrene matrices swollen in water was observed in concentrated solutions containing large-sized lithium, sulfate, and phosphate ions. Volume compressive strain correlated with the size of excluded hydrated ions. The contraction effect was caused by the difference in the osmotic pressure of water in thin pores and water in concentrated solutions filling large pores. The exclusion effect ignored earlier should also influence the degree of ion exchange and volume deformation of standard ion-exchange resins brought in contact with solutions of various electrolytes.
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