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Thermodynamic Properties of a First-Generation Siloxane Dendrimer with Terminal Trimethylsilyl Groups

  • CHEMICAL THERMODYNAMICS AND THERMOCHEMISTRY
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Abstract

The temperature dependence of the heat capacity of a first-generation siloxane dendrimer with terminal trimethylsilyl groups is determined for the first time via high-precision adiabatic vacuum calorimetry in the temperature range of 6 to 347 K, and by differential scanning calorimetry in the temperature range of 330 to 410 K. An anomalous change in heat capacity is detected in the range of T = 42–76 K. A transition is observed in the range of T = 137–153 K, due to devitrification of the dendrimer. The thermal stability of the compound is studied via thermogravimetric analysis. The obtained experimental data are used to calculate standard thermodynamic functions of the dendrimer in the temperature range T → 0 to T = 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 Russian Foundation for Basic Research, project no. 19-03-00248); by the Russian Science Foundation, project no. 18-13-00411.

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Authors and Affiliations

  1. Lobachevsky State University, 603950, Nizhny Novgorod, Russia

    A. V. Markin, Yu. A. Sarmini, S. S. Sologubov & N. N. Smirnova

  2. Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 117393, Moscow, Russia

    K. L. Boldyrev, E. A. Tatarinova, I. B. Meshkov & A. M. Muzafarov

  3. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Moscow, Russia

    K. L. Boldyrev & A. M. Muzafarov

Authors
  1. A. V. Markin
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  2. Yu. A. Sarmini
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  3. S. S. Sologubov
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  4. N. N. Smirnova
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  5. K. L. Boldyrev
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  6. E. A. Tatarinova
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  7. I. B. Meshkov
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  8. A. M. Muzafarov
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Correspondence to A. V. Markin.

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Translated by K. Utegenov

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Markin, A.V., Sarmini, Y.A., Sologubov, S.S. et al. Thermodynamic Properties of a First-Generation Siloxane Dendrimer with Terminal Trimethylsilyl Groups. Russ. J. Phys. Chem. 94, 240–248 (2020). https://doi.org/10.1134/S0036024420020260

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  • DOI: https://doi.org/10.1134/S0036024420020260

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