The thermal decomposition kinetics of poly(1 oxo 2 phenyl trimethylene) prepared by copolymerization of carbon monoxide and styrene were studied by means of thermalgravimetry(TG). The thermal degradation processes were tested under different heating rates in the air and nitrogen atmosphere. It has been found that STCO copolymer has one peak of degradation and the onset temperature in nitrogen atmosphere is much higher than in air. Processing should be performed under nitrogen atmosphere to avoid degrada...