Radical copolymerization of 2-(N,N-dimethyl)aminoethyl methacrylate (1) and acrylonitrile (2) initiated by 2,2’-azobis(2-methylpropionitrile) was carried out. The sequence distributions of the copolymers were investigated by C-13 NMR spectroscopy. A terminal model was used to interpret the propagation process in the copolymerization. The monomer reactivity ratios in the bulk copolymerization at 45 degrees C were evaluated as r(1) = 1.06 and r(2) = 0.07. Radical reactivity indices and frontier electron densities for 1 and 2 were calculated.