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Russian Chemical Bulletin

, Volume 60, Issue 11, pp 2365–2369 | Cite as

Thermodynamics of fluorinated derivatives of carbosilane dendrimers of high generations

  • A. V. Markin
  • Ya. S. Samosudova
  • N. N. Smirnova
  • N. A. Sheremet’eva
  • A. M. Muzafarov
Full Articles

Abstract

The temperature dependences of the heat capacities of fluorinated derivatives of carbosilane dendrimers of high (4.5 and 7.5) generations were studied by adiabatic vacuum calorimetry in the range from 6 to 340 K for the first time. The standard thermodynamic characteristics of devitrification were estimated. The experimental results were used to calculate the standard thermodynamic functions C p °(T), H°(T)−H°(0), S°(T)−S°(0), and G°(T)-H°(0) over the range from T→0 to 340 K and standard entropies of formation of dendrimers at T = 298.15 K. The low-temperature (T ≤ 50 K) heat capacity was analyzed by using Debye’s heat capacity theory of solids and the multifractal model. The values of fractal dimensionality D were determined, and some conclusions about topology of the studied structures were made. The standard thermodynamic characteristics of the studied fluorinated derivatives of carbosilane dendrimers were compared.

Key words

carbosilane dendrimers generation chemical thermodynamics heat capacity devitrification thermodynamic functions 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • A. V. Markin
    • 1
  • Ya. S. Samosudova
    • 1
  • N. N. Smirnova
    • 2
  • N. A. Sheremet’eva
    • 2
  • A. M. Muzafarov
    • 2
  1. 1.Research Institute of ChemistryN. I. Lobachevsky Nizhni Novgorod UniversityNizhni NovgorodRussian Federation
  2. 2.N. S. Enikolopov Institute of Synthetic Polymer MaterialsRussian Academy of SciencesMoscowRussian Federation

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