Application of precise calorimetry in study of polymers and polymerization processes

Thermodynamics of Aliphatic Cyclic Urethanes, of Their Ring-Opening Polymerization, and of Corresponding Polyurethanes

“…[12 -16] The enthalpies of polymerization, D H 0 pol , at T = 298.15 K were calculated from the enthalpies of formation of the monomers and polymers (Table 8) and at other The calculation procedures of the thermodynamic characteristics of the polymerization reactions using the calorimetric data are described in detail elsewhere. [29] It was found that for the processes 1 b and 1 e, the standard Gibbs function of polymerization has relatively large absolute magnitudes of negative values. It follows that, under the physical conditions considered, the thermodynamic equilibrium of these reactions is almost completely shifted towards the formation of the corresponding polymers.…”

Thermodynamic properties and X-ray diffraction of Bi4Ti3O12

“…The calorimeter design and the operation procedure were described earlier [10]. The calorimeter was tested by measuring the heat capacity of high-purity copper and reference samples of synthetic corundum and K-2 benzoic acid.…”

Calorimetric study of tetramethylene urethane and of poly(tetramethylene urethane) between 0 and 300 K

“…(7) reproduces the heat capacities of the monomer and the polymer almost with the same uncertainty as in the ranges from 5 to 12 K and from 9 to 15 K, respectively. The calculation procedure of the functions was similar to that described elsewhere 10) . By our estimation, the uncertainty of the values of the thermodynamic function for the monomer and the polymer is about 1.5% at T a 30 K, 0.5% in the range from 30 to 80 K and approximately 0.2% from 80 to 300 K.…”