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Thermal stability of electron beam-irradiated polytetrafluoroethylene

✍ Scribed by U. Lappan; L. Häußler; G. Pompe; K. Lunkwitz

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
153 KB
Volume
66
Category
Article
ISSN
0021-8995

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✦ Synopsis

Polytetrafluoroethylene (PTFE) was subjected to 1 MeV electron beam irradiation in air. The thermal stability and the degradation fragments of the irradiated polymer were studied in dependence on the radiation dose up to 4 MGy by thermogravimetric analysis coupled with mass spectrometry. The TGA results confirm the known decrease in the thermal stability of irradiated PTFE with increasing radiation dose. At the thermal degradation, CO 2 , HF, and fluorocarbon fragments are evolved from the irradiated samples. CO 2 and HF are formed by decomposition of peroxy radicals up to 250ЊC. In addition, low molecular weight fluorocarbons are desorbed from the irradiated PTFE. At temperatures above 300ЊC, CO 2 is formed by the decarboxylation of radiation-induced COOH groups inside the PTFE.

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