Properties of the functional polymers prepared from functional monomers and those into which the active groups were introduced by a suitable polymer-analog reaction could differ substantially, especially in the active group distribution. In this paper are analyzed specific properties of functional polymers prepared by copolymerization of p-styrenesulfonyl chloride (SSC) with divinylbenzene and styrene. There was determined the polymerization activity of SSC. Resulting Alfrey-Price scheme parameters for SSC are Q(1) = 0.73 and e(1) = 0.58. The swollen-state morphology of a series of polymers prepared in the presence of various solvents was investigated by inverse steric exclusion chromatography both before and after hydrolysis of the sulfochloride groups. Obtained results suggest that copolymerization of SSC with styrene and divinylbenzene does not produce polymers composed from randomly alternating monomer units but rather copolymers consisting of functionalized and unfunctionalized domains resulting from a possible phase separation of SSC-rich domains due to the strong mutual interaction of the functional monomer molecules or polymer segments.