کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1882806 | 1043261 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fluorescent analysis of polytetrafluoroethylene treated by γ-irradiation near the melting point
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
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چکیده انگلیسی
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 10â3 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 Ï-bonds -CF2-(CF=CF)n-CF2- (n=4-7) in the product are responsible for fluorescence. A scheme for the radiation-chemical transformation resulting in Ï-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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 80, Issue 3, March 2011, Pages 522-528
Journal: Radiation Physics and Chemistry - Volume 80, Issue 3, March 2011, Pages 522-528
نویسندگان
Sergei Khatipov, Ravil Nurmukhametov, Yuriy Sakhno, Vasiliy Klimenko, Denis Seliverstov, Tamara Sakhno,