No abstract

In an adiabatic vacuum calorimeter, the temperature dependence of the heat capacity C 0p of dimethylene urethane (DMU) and poly(dimethylene urethane) (PDMU) was studied between 6 and 335 K with an uncertainty of about 0.2%. In a calorimeter with a static bomb and an isothermal shield, the energies of combustion ΔUcomb of the monomer and of the polymer were measured. From the experimental data, the thermodynamic functions C 0p (T), H 0 (T)–H 0 (0), S 0 (T), G 0 (T)–H 0 (0) were calculated in the range from 0 to 335 K, and enthalpies of combustion ΔH 0comb and thermochemical parameters of formation ΔH 0f, ΔS 0f, ΔG 0f of the substances studied were estimated at T = 298.15 K and standard pressure. The results were used to calculate the thermodynamic characteristics of the ring‐opening polymerization of DMU in bulk (ΔH 0pol, ΔS 0pol, ΔG 0pol) with formation of linear poly(dimethylene urethane) in the range from 0 to 330 K. In addition, the ceiling temperature T 0ceil was determined.

No abstract

No abstract

No abstract