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Crosslinked polystyrene is made by copolymerizing styrene with divinylbenzene. Divinylbenzene can polymerize through both vinyl groups. This connects individual chains to form a three-dimensional network. One area of application is, for example, ion exchangers. Cross-linking prevents the ion exchanger from dissolving in the electrolyte solution and later having to be separated from the solution again. The ion exchange particles are produced by suspension polymerization, in which the styrene is finely divided in an aqueous solution for polymerization. This creates the spherical structure. To function as ion exchangers, functional groups are required which are capable of electrolytic dissociation. These groups, e.g. sulfonic acid groups, are subsequently added to the crosslinked polystyrene.