The temperature dependence of heat capacity of triple alternating copolymer ethylene—carbon monoxide—propylene with 23.4 mol.% of propane fragments was studied for the first time by adiabatic and dynamic calorimetry over the range of 6–480 K. The energy of copolymer combustion at 298.15 K was measured in isothermic calorimeter with stationary bomb. The thermodynamic parameters of phase and physical transitions were determined. The standard thermodynamic functions Cp○(T), H○(T) − H○(0), S○(T) − S○(0) and G○(T) − H○(0), for region from T→ 0 to 320 K, the standard enthalpy of combustion and thermodynamic characteristics of formation of the studied compound at 298.15 K were calculated from the experimental data. The thermodynamic parameters of alternating copolymerization of CO with ethylene and propylene at standard pressure over 0–300 K region were detemined.
