Thermodynamics of cross-linked and branched (co)polymers based on tris- and bis-(pentafluorophenyl)germanes
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- 作者：N. N. Smirnova (1) smirnova@ichem.unn.ru
Yu. A. Zakharova (1)
V. A. Ruchenin (1)
O. G. Zamyshlyayeva (1) - 关键词：heat capacity – ; thermodynamic functions – ; cross ; linked and branched (co)polymers on the basis of tris ; and bis ; (pentafluorophenyl)germans – ; hyperbranched polyphenylenegermane
- 刊名：Russian Journal of Physical Chemistry A ; Focus on Chemistry
- 出版时间：April 2012
- 出版年：2012
- 期刊代码：pc384_0036-0244
- 类别：ch
- 卷：86
- 期：4
- 页码：539-547
- 数据来源：sp
摘要
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: C p /掳, H掳(T) - H掳(0), S掳(T) - S掳(0), and G掳(T) - H掳(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.