Thermodynamics of phenylated polyphenylene between 0 and 340 K

The temperature dependence of the heat capacity C-p(o) of phenylated polyphenytene and initial comonomer 1,4-bis(2,4,5-triphenylcyclopentadienone-3-yl)benzene was studied between 0 and 340 K (experimental error - 0.2%) in an adiabatic vacuum calorimeter. Then energies of combustion Delta U-comb were measured in a calorimeter with a static bomb and an isothermal shield. From the experimental data, the thermodynamic functions C-P(0)(T), H-0(T) - H-0(0), S-0(T) - S-0(0), G(0)(T) - H-0(O) were calcutated in the range of 0-340 K. The standard enthalpies of combustion Delta H-comb(0) and thermodynamic parameters of formation - enthalpies A-HI, entropies Delta S-f(0), the Gibbs functions Delta G(f)(0) of the substances studied were estimated at T=298.15 K at standard pressure. The results were used to calculate the thermodynamic characteristics of the reaction (Delta H-r(0), Delta S-r(0), Delta G(r)(0)) of phenylated polyphenylene formation in the range of 0-340 K.