1997
DOI: 10.1002/macp.1997.021980104
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Calorimetric study of tetrahydro‐1,3‐oxazin‐2‐one and poly(oxy‐1,3‐propanediyliminocarbonyl), and the polymerization/depolymerization equilibrium

Abstract: In adiabatic vacuum and dynamic calorimeters the temperature dependence of the heat capacity Cn of tetrahydro-1,3-oxazin-2-one (THO) and poly(oxy-1,3-propanediyIiminocarbonyl) &THO) was studied between 5 and 500K. 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 AUcomb of the monomer and the polymer were measured. From the … Show more

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Cited by 15 publications
(28 citation statements)
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“…A small vague hump in C 0 p = f (T) of PTMU in the range of premelting is explained by the existence of some crystalline modification of PTMU, different from the main one which melts at a higher temperature. [13] In other respects, the temperature dependence of C 0 p does not exhibit peculiarities: the heat capacities gradually increase as the temperature increases.…”
Section: Heat Capacitymentioning
confidence: 99%
See 1 more Smart Citation
“…A small vague hump in C 0 p = f (T) of PTMU in the range of premelting is explained by the existence of some crystalline modification of PTMU, different from the main one which melts at a higher temperature. [13] In other respects, the temperature dependence of C 0 p does not exhibit peculiarities: the heat capacities gradually increase as the temperature increases.…”
Section: Heat Capacitymentioning
confidence: 99%
“…Thermodynamic parameters of melting (T 0 fus ; DH 0 fus ; DS 0 fus ; DC 0 p ðT 0 fus ÞÞ were determined for TMU [13] and DMTMU. [15] Their numerical values are given in Table 3.…”
Section: Thermodynamic Parameters Of Meltingmentioning
confidence: 99%
“…The enthalpy of the process D H 0 pol then is calculated from the enthalpies of combustion or formation. When the temperature dependence of the heat capacity for the reagent starting from a temperature as low as possible (usually 4 -5 K), is known, entropies of the polymer and the monomer are estimated from the third law of thermodynamics; from the difference the polymerization entropyDS In our previous work 1,2) the results of the calorimetric study of the thermodynamic characteristics of ring-opening polymerization of trimethylene urethane (TU) and dimethyltrimethylene urethane (DTU) (Eq. 4 and Eq.…”
Section: Introductionmentioning
confidence: 99%
“…For PPMU, the rootmean-square deviation of the C 0 p points from the corresponding smoothed curve C 0 p ¼ f(T) was AE0.10% over the range 6 to 100 K, AE0.03% from 100 to 337 K and AE0.2% between 330 and 437 K; in the case of PHMU, AE0.07% from 7.6 to 88 K, AE0.03% in the range 88 to 330 K and AE0.3% between 330 and 450 K. Figure 1 shows the experimental C Figure 1) can be explained with the possible availability of some crystalline modifications of PPMU and PHMU distinguishing from the principal modifications that melt at a higher temperature. [3] For the rest, the temperature dependences of C fus . The grounds for such extrapolations are described in detail in ref.…”
Section: Heat Capacitymentioning
confidence: 99%
“…The calorimetric data on the thermodynamic properties for PU with k ¼ 2 À 4 (in some cases with one or two substituents) such as poly(dimethylene urethane), poly(trimethylene urethane), poly(5-methyltrimethylene urethane), poly(5,5-dimethyltrimethylene urethane) were published previously. [2][3][4][5][6][7][8] Summary: The thermodynamic properties -the temperature dependence of heat capacity and the temperatures and enthalpies of physical transitions -of poly(pentamethylene urethane) and poly(hexamethylene urethane) have been studied over the range 6 to 450 K by precision adiabatic vacuum and dynamic calorimetry. Their energies of combustion, D c U, have been measured in a calorimeter with a static bomb and an isothermal shield.…”
Section: Introductionmentioning
confidence: 99%