Luminescence and color of radiation-modified polytetrafluoroethylene in blocks

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

doi:10.1134/s0965545x08120055

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…Centers III and IV absorbed partially in the violet and blue regions. Modified samples with such absorption centers could acquire only a light-yellow or golden yellow color, as reported earlier [7].…”

supporting

confidence: 65%

“…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.…”

mentioning

confidence: 94%

“…We reported results from a spectral and luminescence analysis under the same conditions (330 o C, 2⋅10 5 Gy) of bulk blocks of modified PTFE [7]. It was shown that they contained the same fluorescence centers as the modified films.…”

mentioning

confidence: 96%

“…Layers removed from the surface by more than 2 mm did not exhibit fluorescence. It was also noted [7] that the color of the sample and the fluorescence emission spectrum depended on the temperature at which the γ-irradiation was performed and the absorbed dose. It was found recently [8] that PTFE films irradiated by α-particles also exhibited fluorescence, the spectrum of which was located in the range 430-580 nm with a maximum at 530 nm.…”

mentioning

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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confidence: 99%

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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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supporting

confidence: 65%

mentioning

confidence: 94%

mentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

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