Fluorescent analysis of polytetrafluoroethylene treated by γ-irradiation near the melting point

Radiation-modified polytetrafluoroethylene (PTFE), which exhibits intense fluorescence in the visible spectral region, was prepared. Radiation modification was performed with 60Co rays at 330 °C, at a dose of 0.2 MGy and an atmospheric air pressure ranging from 10 −3 to 100 mbar. The fluorescence an...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2011-03, Vol.80 (3), p.522-528
Main Authors: Khatipov, Sergei, Nurmukhametov, Ravil, Sakhno, Yuriy, Klimenko, Vasiliy, Seliverstov, Denis, Sakhno, Tamara
Format: Article
Language:English
Subjects:
Accumulation
Atmospherics
Blocking
Electronics
Fluorescence
Fluoroalkyl
Molecular structure
Peroxide macroradicals
Polyene
Polytetrafluoroethylene
Polytetrafluoroethylenes
Spectra
Transformations
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Summary:Radiation-modified polytetrafluoroethylene (PTFE), which exhibits intense fluorescence in the visible spectral region, was prepared. Radiation modification was performed with 60Co rays at 330 °C, at a dose of 0.2 MGy and an atmospheric air pressure ranging from 10 −3 to 100 mbar. The fluorescence and electronic absorption spectra of film and block PTFE specimens irradiated under the given conditions were studied. It was concluded that polyene systems of π-bonds –CF 2–(CF=CF) n –CF 2– ( n=4–7) in the product are responsible for fluorescence. A scheme for the radiation-chemical transformation resulting in π-conjugated structures was proposed. The important role of molecular oxygen in radiation-chemical processes responsible for the generation and build-up of fluorescing entities was revealed.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2010.11.012