Abstract
Radiation-modified polytetrafluoroethylene (PTFE) that exhibited intense fluorescence in the visible spectral region was prepared. Radiation modification was performed with 60Co γ rays at 330°C, a dose of 0.2 MGy, and an atmospheric air pressure ranging from 10−3 to 100 mmHg. The fluorescence and electronic absorption spectra of film (95 µm) specimens irradiated under the given conditions were studied. An important role of molecular oxygen in radiation-chemical processes responsible for the generation and buildup of fluorescing entities was revealed. The spectral characteristics of the four most intense fluorescent centers were determined. It was concluded that polyene systems of π bonds-CF2-(CF=CF)n-CF2-(n=4−11) in the product are responsible for fluorescence. A scheme of radiation-chemical transformation resulting in π-conjugated structures was proposed.
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