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Russian Journal of Physical Chemistry A

, Volume 87, Issue 4, pp 552–559 | Cite as

Thermodynamics of G-3(D4) and G-6(D4) carbosilanecyclosiloxane dendrimers

  • N. N. Smirnova
  • A. V. MarkinEmail author
  • Ya. S. Samosudova
  • G. M. Ignat’eva
  • E. Yu. Katarzhnova
  • A. M. Muzafarov
Chemical Thermodynamics and Thermochemistry

Abstract

Temperature dependences of the heat capacity of G-3(D4) and G-6(D4) carbosilanecyclosiloxane dendrimers are studied for the first time by precision adiabatic vacuum and differential scanning calorimetry in the range of 6 to 350–450 K. Physical transformations in the investigated temperature range are observed and their standard thermodynamic characteristics are determined and discussed. Standard thermodynamic functions for a mole unit are calculated from the experimental data: C p (T), H (T), − H (0), S (T) − S (0), and G (T) − H (0) in the range of T → 0 to (350–449) K and standard entropies of formation at 298.15 K. Low-temperature (T ≤ 50 K) heat capacity is analyzed using the Debye theory of heat capacity of solids and the multifractal model. The values of fractal dimensionality D are determined and some conclusions on the topology of the investigated structures are drawn. The corresponding thermodynamic properties of the investigated carbosilanecyclosiloxane dendrimers under study are compared.

Keywords

carbosilanecyclosiloxane dendrimers heat capacity thermodynamic characteristics 

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • N. N. Smirnova
    • 1
  • A. V. Markin
    • 1
    Email author
  • Ya. S. Samosudova
    • 1
  • G. M. Ignat’eva
    • 2
  • E. Yu. Katarzhnova
    • 2
  • A. M. Muzafarov
    • 2
  1. 1.Lobachevsky Nizhni Novgorod State UniversityNizhni NovgorodRussia
  2. 2.Enikolopov Institute of Synthetic Polymer MaterialsRussian Academy of SciencesMoscowRussia

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