The ST-IPCA copolymers are amorphous and show no crystalline DSC endotherm. Results of thermal analysis of ST-IPCA copolymers are presented in Table . Information on the degradation of the copolymers was obtained from thermogravimetric analysis. Decomposition of the copolymers in nitrogen occurred in two steps, first in the 200-500ºC range with residue (1.8-3.3% wt.), which then decomposed in the 500-800ºC range.