Electron beam irradiation of polytetrafluoroethylene in vacuum at elevated temperature: An infrared spectroscopic study

Electron beam irradiation of polytetrafluoroethylene (PTFE) has been performed in vacuum both at elevated temperature above the melting point of PTFE and at room temperature for comparison. The changes in the chemical structure were studied by Fourier‐transform infrared (FTIR) spectroscopy. The form...

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Bibliographic Details
Published in:Journal of applied polymer science 1999-11, Vol.74 (6), p.1571-1576
Main Authors: Lappan, U., Geißler, U., Lunkwitz, K.
Format: Article
Language:English
Subjects:
Applied sciences
Crosslinking and degradation
electron beam irradiation
Exact sciences and technology
FTIR spectroscopy
modification
Physicochemistry of polymers
Polymers and radiations
polytetrafluoroethylene
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Summary:Electron beam irradiation of polytetrafluoroethylene (PTFE) has been performed in vacuum both at elevated temperature above the melting point of PTFE and at room temperature for comparison. The changes in the chemical structure were studied by Fourier‐transform infrared (FTIR) spectroscopy. The formation of double bonds in PTFE was confirmed as a result of irradiation in vacuum. Moreover, trifluoromethyl (CF3) branches were detected. The concentration of CF3 branches was found to be much higher in irradiation at elevated temperature than in room temperature irradiation. The CF3 branches are assumed to cause the reduced crystallinity indicated by the transparency of PTFE specimens irradiated in the molten state. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1571–1576, 1999
ISSN:0021-8995
1097-4628
DOI:10.1002/(SICI)1097-4628(19991107)74:6<1571::AID-APP32>3.0.CO;2-X