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 Cp°(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.
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