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Ring-opening polymerization of 2-methyl-2-oxazoline initiated by 2-@-nitrobenzenesulfonato)ethyl methacrylate follows the so-called "living mechanism", i. e. fast initiation compared to slow propagation and no chain transfer. Accordingly, methacryl macromonomers having homopolymers, block or random copolymers of 2-methyl and 2-pentyl-2-oxazoline backbones with narrow molecular weight distribution were obtained. Termination of the propagating species by ion-exchange or aminolysis with triethylamine yielded hydroxyl and quaternary ammonium terminated macromonomers, respectively.