By adiabatic vacuum and dynamic calorimetry, heat capacity for poly[bis(trifluoroethoxy)phosphazene] has been determined over the 6–620 K range. Physical transformations of the polymer on its heating
and cooling have been detected and characterized. Smoothed heat capacity Cp0(T) and standard thermodynamic functions (H0(T)-H0(0), S0(T) and G0(T)-H0(0)) of poly[bis(trifluoroethoxy)phosphazene] have been evaluated for the temperature range from T→0 to 560 K. The standard entropy of formation ΔfS0 at T=298.15 K has been also determined. Fractal dimensions D in the heat capacity function of the multifractal variant of Debye’s theory of heat capacity of solids characterizing the
heterodynamics of the tested polymer have been determined.