Carbosilane dendrimer of second generation with terminal methoxyundecylenate groups |
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| Authors: | Lebedev B. V. Kulagina T. G. Ryabkov M. V. Ponomarenko S. A. Makeev E. A. Boikov N. I. Shibaev V. P. Rebrov E. A. Muzafarov A. M. |
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| Affiliation: | (1) Chemistry Institute, Nizhny Novgorod State University, Nizhny Novgorod, Russia;(2) Chemistry Department, Moscow State University Moscow, Russia;(3) Institute of Synthetic Polymer Materials of Ras Moscow, Russia |
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| Abstract: | The thermodynamic properties of carbosilane dendrimer of second generation with terminal methoxyundecylene groups were studied between 6 and 340 K by adiabatic vacuum calorimetry: the temperature dependence of the molar heat capacity Cp 0 was measured, the physical transformations were established and their thermodynamic characteristics were obtained. The experimental data were used to calculate the thermodynamic functions Cp 0 (T), H 0(T)-H 0(0), S0(T), G 0(T)-H 0(0) of the compound in the range 0 to 340 K. from the relation Cp 0 (T) the fractal dimension of the dendrimer was experimentally determined. The heat capacity of the dendrimer was compared with the corresponding additive values calculated from the properties of its constituents - a dendritic matrix (carbosilane dendrimer of second generation) and the corresponding amount of moles of methyl ester of 11-(tetramethyldisiloxy)undecanoic acid serving as terminal groups. This revised version was published online in July 2006 with corrections to the Cover Date. |
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