✦ LIBER ✦

Temperature influence on the stability and chemical composition of electron beam-irradiated polytetrafluoroethylene

✍ Scribed by K. Schierholz; U. Lappan; A. Petr; L. Dunsch; K. Lunkwitz

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 222 KB
Volume: 37
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19990901)37:17<2404::aid-polb11>3.0.co;2-4

No coin nor oath required. For personal study only.

✦ Synopsis

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 oxygencontaining 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.

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