A comparison of the spectra of the monomers, copolymers and polystyrene shows, that the reaction between the trisubstituted ethylenes and styrene is a copolymerization. IR spectra of the copolymers show overlapping bands in 3250-2700 cm All the copolymers were amorphous and show no crystalline DSC endotherm on repeated heating and cooling cycles. Table shows glass transition values for the ST-ICPA copolymers prepared in this work with no correlation to the size and position of the ICPA ring substitution apparently due to non-uniform composition, monomer unit distribution, and/or molecular weight and MWD. A single Tg was observed for all the copolymers with values 111-166ºC. Information on thermal stability of the copolymers (Table ) was obtained from thermogravimetric analysis (Table ). Decomposition of the copolymers in nitrogen occurred in two steps, first in the 219-500ºC range with residue (0.9-5.6% wt), which then decomposed in the 500-800ºC range. The decomposition products were not analyzed in this study, and the mechanism has yet to be investigated.