ABC triblock copolymers of methyl methacrylate (MMA), (dimethylamino)ethyl methacrylate ( DMAEMA ) , and tetrahydropyranyl methacrylate ( THPMA ) consisting of 12 units of each type of monomer were synthesized by group transfer polymerization ( GTP ) . These were the three topological isomers with different block sequences: DMAEMA 12 -THPMA 12 -MMA 12 , DMAEMA 12 -MMA 12 -THPMA 12 , and THPMA 12 -DMAEMA 12 -MMA 12 . The molecular weights and molecular weight distributions of the copolymers were determined by gel permeation chromatography ( GPC ) in tetrahydrofuran, and their number-average degrees of polymerization and copolymer compositions were calculated by proton nuclear magnetic resonance spectroscopy ( 1 H-NMR ) . These molecular weights and degrees of polymerization corresponded closely to the values expected from the monomer / initiator ratios. The polydispersities were low as expected for GTP, and ranged from 1.09 to 1.25. The three triblocks were chemically modified by converting the THPMA units to methacrylic acid ( MAA ) units either by thermolysis or acid hydrolysis. The resulting ABC triblock polyampholytes were characterized by 1 H-NMR spectroscopy and hydrogen ion titration. Aqueous GPC studies in 1.0 M NaCl at pH 8.5 showed that the triblock copolymers form micelles whose size depends on their block sequence.