SEARCH Articles Figures Tables Cross polymer Cross polystyrene Cross-linking of polymers Hydration, of polymer Linked polymer Polymer cross-link Polymer hydration Polymer polystyrene-sulfonate Polymers sulfonation Polystyrene cross-linked Polystyrene polymers Polystyrene sulfonate Polystyrene sulfonation Polystyrene, cross-linking Sulfonated cross-linked Sulfonated polystyrene Sulfonation of polystyrene Sulfone polymers