Macroporous copolymer beads were prepared by free radical suspension polymerization of styrene with divinylbenzene in presence of n-heptane and 2-ethyl-1-hexanol as diluent for the monomers. The copolymer particles were then sulfonated with a 40-wt% chlorosulfonic acid solution in dichloroethane at room temperature for 48 hours. The influence of the chlorosulfonation reaction on surface morphology of the beads was studied as function of diluent and divinylbenzene content. It was established that chlorosulfonation reaction led to the morphological changes in the macromolecular network prepared with 100% n-heptane, 100% 2-ethyl-1-hexanol for 20% DVB or with 30 and 40% DVB amount for 80/20 n-heptane/2-ethyl-1-hexanol.