Anionic polymerization of methacrylate-functionalized ionic monomers, 2-(methacryloyloxy)ethyltrimethylammonium chloride (MTAC) and 3-(N-2-methacryloyloxyethyl-N,N-dimethyl)-ammonatopropanesulfonate (MAPS), was performed using conventional alkyl lithium as an initiator in ionic liquid, leading to poly(MTAC) (PMTAC) and poly(MAPS) (PMAPS). During an anionic polymerization, ionic liquid acts as solvent and additive. The dual role of ionic liquid gives PMAPS heterotactic configuration.