The Influence of the Irradiation Temperature on the Ratio of Chain Scission to Branching Reactions in Electron Beam Irradiated Polytetrafluoroethylene (PTFE)
| Autor: | Uwe Geißler, Uwe Lappan, Ulrich Scheler |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
Polytetrafluoroethylene Polymers and Plastics General Chemical Engineering Chemical structure Organic Chemistry Analytical chemistry Infrared spectroscopy Branching (polymer chemistry) chemistry.chemical_compound Solid-state nuclear magnetic resonance chemistry Polymer chemistry Materials Chemistry Cathode ray Molecule Irradiation |
| Zdroj: | Macromolecular Materials and Engineering. 292:641-645 |
| ISSN: | 1438-7492 |
| DOI: | 10.1002/mame.200600495 |
| Popis: | Polytetrafluoroethylene (PTFE) films have been irradiated by electron beam in vacuum at various temperatures ranging from room temperature up to temperatures far above the melting temperature. Changes of the chemical structure have been analyzed by 19 F solid-state NMR and IR spectroscopy. The concentration of several structures generated by irradiation increases with increasing irradiation temperature up to the beginning of the thermal degradation. The molar ratio of >CF- branching points to -CF 3 end groups changes with crossing of the melting temperature. The generation of >CF- branching points is accelerated if the PTFE is irradiated in the molten state, where branching reactions become more important. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text