Temperature influence on the stability and chemical composition of electron beam-irradiated polytetrafluoroethylene
| Autor: | K. Lunkwitz, K. Schierholz, A. Petr, L. Dunsch, U. Lappan |
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| Rok vydání: | 1999 |
| Předmět: |
Reaction mechanism
Polytetrafluoroethylene Polymers and Plastics Chemistry Radical Free-radical reaction chemistry.chemical_element Condensed Matter Physics Photochemistry chemistry.chemical_compound Polymer chemistry Materials Chemistry Fluorine Thermal stability Irradiation Physical and Theoretical Chemistry Thermal analysis |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 37:2404-2411 |
| ISSN: | 1099-0488 0887-6266 |
| DOI: | 10.1002/(sici)1099-0488(19990901)37:17<2404::aid-polb11>3.0.co;2-4 |
| Popis: | Polytetrafluoroethylene powder (PTFE) was exposed to electron beam radiation in presence of air. The irradiation mainly resulted in chain scission and induction of oxygenated groups and radicals as well as unsaturation. The thermal behavior of the irradiated PTFE and the fate of the radicals were studied comprehensively. Apart from fluorine, saturated and unsaturated fluorocarbons and oxygen-containing groups were released during heating. Furthermore, irradiation-generated peroxy radicals were transformed into alkyl radicals in a partly reversible process. A proposal for the complex reaction mechanisms of irradiated PTFE is given. The thermal stability of irradiated PTFE was improved by annealing. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 2404–2411, 1999 |
| Databáze: | OpenAIRE |
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