Copolymers of the ST and the ICPA monomers were prepared in 25-mL glass screw cap vials at ST/ICPA = 3 (mol) the monomer feed using 0.12 mol/L of ABCN at an overall monomer concentration 2.44 mol/L in 10 mL of toluene. The copolymerization was conducted at 70ºC. After a predetermined time, the mixture was cooled to room temperature, and precipitated dropwise in methanol. The conversion of the copolymers was kept between below 20% to minimize compositional drift. The composition of the copolymers was determined based on the nitrogen content. The ST-ICPA copolymers were characterized by nitrogen elemental analysis, FTIR, 1 H-and 13 C-NMR spectroscopies. Thermal behavior was studied by DSC and TGA.