Terpolymerizations of cyclohexene oxide, CO₂, and isocyanates or isothiocyanates for the synthesis of poly(carbonate-urethane)s or poly(carbonate-thioimidocarbonate)s

Terpolymerization of cyclohexene oxide (CHO), CO2, and aryl isothiocyanates produced poly(carbonate-thioimidocarbonate)s with gradient character, while that of CHO, CO2, and aryl isocyanates furnished poly(carbonate-urethane)s with random sequences. The former underwent partial degradation upon acid treatment or UV irradiation, while the latter was stable under the same conditions.