Thermodynamics of cross-linked and branched (co)polymers based on tris- and bis-(pentafluorophenyl)germanes

Autor:	N. N. Smirnova, O. G. Zamyshlyayeva, V. A. Ruchenin, Yu. A. Zakharova
Rok vydání:	2012
Předmět:	chemistry.chemical_classification Tris chemistry.chemical_compound chemistry Polymer chemistry Physical chemistry Polymer Physical and Theoretical Chemistry Atmospheric temperature range Adiabatic process Heat capacity
Zdroj:	Russian Journal of Physical Chemistry A. 86:539-547
ISSN:	1531-863X 0036-0244
DOI:	10.1134/s003602441204022x
Popis:	The temperature dependence of the heat capacity of cross-linked and branched (co)polymers based on tris- and bis-(pentafluorophenyl)germanes is studied in the temperature range of 6–7 to 535–570 K, using adiabatic vacuum and differential scanning calorimeters. In the indicated temperature range, physical transformations are revealed and their thermodynamic characteristics are determined. The obtained experimental data are used to calculate the thermodynamic functions of (co)polymers: Cp/°, H°(T) - H°(0), S°(T) - S°(0), and G°(T) - H°(0) in the range of T → 0 to 535 K for the branched (co)polymer and from T → 0 to 500 K for the cross-linked polymer. Their standard entropies of formation are determined at 298.15 K. The obtained results are compared with analogous data for hyperbranched perfluorinated polyphenylenegermane studied earlier. The effect of the structure of polyphenylenegermanes on their thermodynamic properties is analyzed.
Databáze:	OpenAIRE
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