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- W2054351684 abstract "In adiabatic vacuum and dynamic calorimeters the temperature dependence of the heat capacity Cp0 of tetrahydro-1,3-oxazin-2-one (THO) and poly(oxy-1,3-propanediyliminocarbonyl) (PTHO) was studied between 5 and 500 K. The melting temperature of the monomer and the polymer, the enthalpies of melting of THO and the glass transition temperature of PTHO were determined. In a calorimeter with a static bomb and an isothermal shield the energies of combustion ΔUcomb of the monomer and the polymer were measured. From the experimental data the thermodynamic functions Cp0, H0(T) – H0(O), S0(T), G0(T) – H0(0) were calculated in the range of 0 to 450 K, and enthalpies of combustion ΔHcomb0 and thermochemical parameters of formation ΔHf0, ΔSf0, ΔGf0 of the compounds studied were estimated at T = 298.15 K and standard pressure. The results obtained were used to estimated the thermodynamic characteristics of the equilibrium of THO polymerization in bulk (ΔHpol0, ΔSpol0, ΔGpol0), with opening of the six-membered ring and formation of the linear polymer PTHO, in the range 0 to 450 K. It was found that the ΔGpol0 values are always negative and change from −18 kJ · mol−1 at 0 K to −14 kJ · mol−1 at 450 K. Thus, the process equilibrium is everywhere shifted towards the formation of the polymer. The upper (ceiling) limiting temperature of THO polymerization in bulk at standard pressure is Tceil = 750 K, that is, considerably higher than the temperature of the onset of the thermal polymer decomposition (450 K)." @default.
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- W2054351684 date "1997-01-01" @default.
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- W2054351684 title "Calorimetric study of tetrahydro-1,3-oxazin-2-one and poly(oxy-1,3-propanediyliminocarbonyl), and the polymerization/depolymerization equilibrium" @default.
- W2054351684 doi "https://doi.org/10.1002/macp.1997.021980104" @default.
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