Thermodynamics of fluorinated derivatives of carbosilane dendrimers of high generations |
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| Authors: | A. V. Markin Ya. S. Samosudova N. N. Smirnova N. A. Sheremet��eva A. M. Muzafarov |
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| Affiliation: | 1. Research Institute of Chemistry, N. I. Lobachevsky Nizhni Novgorod University, 23/5 prosp. Gagarina, 603950, Nizhni Novgorod, Russian Federation
2. N. S. Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 ul. Profsoyuznaya, 117393, Moscow, Russian Federation
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| 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. |
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