New graft copolymers were synthesized from the free radical polymerization of N-isopropylacrylamide (NIPAAm) and 2-methyl-2-oxazoline (MM) macromonomers initiated by 2,2'-azobisisobutyronitrile in dimethylformamide. The macromonomers, with polymerization degrees 31 and 62, were synthesized by ring-opening cationic polymerization of 2-methyl-2-oxazoline initiated by chloromethylstyrene in the presence of sodium iodide. The grafted macromonomers and copolymers were characterized by proton nuclear magnetic resonance spectrometry (1H-RMN) and the conformational transition temperature was determined by turbidimetric measurements and 1H-RMN spectroscopy. The NIPAAm / MM molar ratio in the copolymer, determined by 1H-RMN, was higher than in the feed to the reactor due to the higher reactivity of the NIPAAm due to its greater diffusivity in the reacting medium due to its lower molecular weight. ...