Spectrophotometric and luminescent analysis of polytetrafluoroethylene treated by γ-irradiation near the melting point

Khatipov, S. A.; Nurmukhametov, R. N.; Seliverstov, D. I.; Sergeev, A.

doi:10.1134/s0965545x06020088

Cited by 12 publications

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“…The fluorescence spectrum of A60 was characterized by a maximum at 365 nm and an inflection at 415 nm. Fluorescence spectra of the A-samples had positions and shapes that were identical to spectra of modified films obtained earlier [6]. As already noted, the film spectra were superpositions of fluorescence bands of four principal fluorescence centers.…”

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confidence: 94%

“…It was found [6] that PTFE films acquired fluorescent properties after irradiation at an absorbed dose of 2⋅10 5 Gy at 330 o C. Molecular oxygen that was present in minute quantities in the polymer was responsible for the formation of optical emission centers in the radiation-modified PTFE. It was found that four types of optical emission centers that differed in fluorescence and excitation spectra were formed.…”

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confidence: 98%

“…In continuation of previous work [6,7], herein the fluorescence properties and color of samples were studied as a function of absorbed dose of γ-radiation. In addition, the effect of the irradiation conditions on the formation of optical color and fluorescence centers was studied because film and block samples were previously treated with radia- Vol.…”

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confidence: 99%

“…We hypothesized earlier [6,7] that these centers had polyene structures (-CF=CF-) n , n = 4-7. The basis for this was the fact that a conjugated system of double bonds was observed using UV absorption and luminescence spectra in polymers treated with UV light, ionizing radiation, and/or heat.…”

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Formation of optical color and fluorescence centers in polytetrafluoroethylene under γ-irradiation

et al. 2011

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541.65+541.15):535.37 Fluorescent properties and colors of polytetrafluoroethylene (PTFE) samples were studied as functions of absorbed dose of γ-radiation at a temperature above the melting temperature of the crystallites (327 o C) in the dose range 0.2-0.8 MGy. The samples were irradiated at low pressure (10 -6 Torr) in glass ampuls and at atmospheric pressure in a chamber purged with argon. Samples in ampuls acquired an off-white tint and fluoresced weakly. The fluorescence intensity increased slowly as the radiation dose increased from 0.2 to 0.6 MGy and decreased at 0.8 MGy. Samples irradiated in the chamber fluoresced more strongly and acquired colors that changed from gray (0.2 MGy) to dark-brown (0.8 MGy). Color centers were formed only in the sample surface layer. Their appearance was associated with the adsorption of particles of an unknown nature from the environment. The argon-purged samples turned white upon removing their surface layer (50 μm). The intensity and shape of fluorescence bands emitted by these samples remained essentially unaltered, i.e., depended weakly on the absorbed dose in the range 0.2-0.8 MGy.

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confidence: 94%

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confidence: 98%

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confidence: 99%

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confidence: 99%

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