Abstract The temperature dependence of the heat capacity of polybutyleneglycol adipate (PBGA) has been investigated in an adiabatic calorimeter over the range 80–470 K. The temperature and the enthalpy of melting were determined for PBGA, as well as the glass transition temperature. The thermodynamic functions of the polymer in various physical states were calculated over the range 0–460 K. The zero entropy was evaluated for glasslike PBGA, and the enthalpy difference was calculated for the completely amorphous and completely crystalline polymer at 0 K. The combustion energy and the standard enthalpy of formation of PBGA were determined in an isothermal calorimeter equipped with a static gas cylinder. The results obtained provided a basis for the calculation of thermodynamic parameters of synthesis of PBGA by polycondensation of tetramethylene glycol and adipic acid.