Copolymers containing free amino groups were prepared via the cationic copolymerization of 2-ethyl-2-oxazoline with 2-(4-aminophenyl)-2-oxazoline. The mechanism of copolymerization was studied via a model polymerization of 2-ethyl-2-oxazoline in the presence of ethyl 4-aminobenzoate (EAB) as the...