|
|||||
|
|
Synthesis and properties of hyperbranched copolymers based on perfluorinated germanium hydrides |
|
| Authors: | O G Zamyshlyayeva Yu D Semchikov K V Kir’yanov E R Gasilova M A Simonova A P Filippov A V Kozlov G A Shandryuk M N Bochkarev |
| Institution: | 1. Nizhni Novgorod State University, pr. Gagarina 23, korp. 2, Nizhni Novgorod, 603950, Russia 2. Institute of Macromolecular Compounds, Russian Academy of Sciences, Bol’shoi pr. 31, St. Petersburg, 199004, Russia 3. St. Petersburg State Technological University of Plant Polymers, ul. Ivana Chernykh 4, St. Petersburg, 198095, Russia 4. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia 5. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, ul. Tropinina 49, Nizhni Novgorod, 603950, Russia |
| Abstract: | Hyperbranched copolymers of various structures and molecular masses in the range 2.0 × 104?4.4 × 105 are prepared via the activated copolycondensation of tris- and bis(pentafluorophenyl)germane in tetrahydrofuran performed in the presence of triethylamine as an activator. The kinetics of copolycondensation is studied via the method of heat-conduction reaction calorimetry. It is found that tris(pentafluorophenyl)germane shows a higher activity in copolycondensation than bis(pentafluorophenyl)germane. Shear moduli, loss factors, and glass-transition temperatures of the copolymers are determined by dynamic mechanical analysis and differential-scanning calorimetry. The copolymers feature glass-transition temperatures up to 250°C. These values are considerably higher than those of perfluorinated polyphenylenegermane (162°C). |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |