Abstract
Precision adiabatic vacuum calorimetry and differential scanning calorimetry in the range of 6–650 K are used to study the temperature dependence of the heat capacity of a hyperbranched pyridylphenylene polymer with a phenylene bridging group. An anomalous change in the heat capacity (a glassy G transition) is revealed in the low-temperature range of 10–18 K. The heat capacity curve displays an exothermic effect starting from T = 400 K, due to the crosslinking of hyperbranched polymer macromolecules. The obtained experimental data are used to calculate the polymer’s standard thermodynamic functions for the range of T → 0 to 400 K, along with the standard entropy of its formation at T = 298.15 K.
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Funding
This work was supported by the RF Ministry of Science and Higher Education, project no. 0729-2020-0039; the Priority 2030 Strategic Academic Leadership Program, project N-489-99_2021-2022; and RF Presidential Grant for Young Scientists and Graduate Students no. SP-1369.2022.4.
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Markin, A.V., Smirnova, N.N., Sologubov, S.S. et al. Thermodynamic Properties of a Hyperbranched Pyridylphenylene Polymer with a Phenylene Bridging Group. Russ. J. Phys. Chem. 96, 1888–1894 (2022). https://doi.org/10.1134/S0036024422090230
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DOI: https://doi.org/10.1134/S0036024422090230