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Authors
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Lappan, U. ; Geißler, U. ; Lunkwitz, K.
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Title
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Changes in the chemical structure of polytetrafluoroethylene induced by electron beam irradiation in the molten state
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Date
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11.10.2000
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Number
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8922
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Abstract
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Polytetrafluoroethylene (PTFE) was exposed to elec<br />tron beam radiation at elevated temperature above the melting point under nitrogen atmosphere and in vacuum for comparison. Fourier-transform infrared (FTIR) spectroscopy was used to study the changes in the chemical structure. The irradiation under nitrogen atmosphere leads to the same structures as described recently for PTFE irradiated in vacuum. Trifluoromethyl branches and double bond structures were detected. The concentrations of terminal and internal double bonds are higher after irradiation under nitrogen than in vacuum. Annealing experiments have shown that the thermal oxidative stability of the radiation-modified PTFE is reduced compared to unirradiated PTFE. The reason are the formation of unstable structures such as double bonds.
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Publisher
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Radiation Physics and Chemistry
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Wikidata
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Citation
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Radiation Physics and Chemistry 59 (2000) 317-322
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DOI
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https://doi.org/10.1016/S0969-806X(00)00269-3
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