Comparative IR study of tetrafluoroethylene telomeres exposed to gamma irradiation in air and in vacuum

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Abstract

Five samples of tetrafluoroethylene (TFE) telomers with different monomer concentrations (Сi) in carbon tetrachloride were obtained by radiation telomerization. It was found that the IR spectra of the obtained telomers differ from the IR spectrum of polytetrafluoroethylene mainly by the presence of an absorption band of terminal CCl3 groups at 850 cm–1, the intensity of which (I850) increases with decreasing Сi. It was shown that the dependence of I850 on Сi is well described by a fractional rational function. Then, dry telomers were treated with 60Co γ-rays with a total dose of 1020 kGy both in air and vacuum. A detailed analysis of the IR spectra of the irradiated samples showed that in vacuum, transformation or detachment of terminal CCl3 groups occurs. When telomeres are irradiated in air, in addition to this, the formation of carboxyl (-COOH) groups is observed. If the stability of the telomere is associated with the formation of -COOH groups, then for the studied series of telomeres, the stability increases with the growth of Сi.

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About the authors

Yu. M. Shul’ga

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the RAS

Email: kga@icp.ac.ru
Russian Federation, Chernogolovka

G. A. Kichigina

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the RAS

Author for correspondence.
Email: kga@icp.ac.ru
Russian Federation, Chernogolovka

P. P. Kushch

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the RAS

Email: kga@icp.ac.ru
Russian Federation, Chernogolovka

D. P. Kiryukhin

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the RAS

Email: kga@icp.ac.ru
Russian Federation, Chernogolovka

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Supplementary files

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2. Fig. 1. IR spectra of the studied telomers before irradiation. The initial concentration of TFE (Ci) in mass % is indicated in the figure.

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3. Fig. 2. Dependence of the intensity of the absorption band at 850 cm–1 on the concentration of TFE Ci. Black circles are experimental points, the solid red line is a description of the experimental data using formula (2).

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4. Fig. 3. Fragments of the IR spectra of sample TR6 before irradiation and after irradiation in vacuum and in air.

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5. Fig. 4. Intensities of the absorption band at 850 cm–1 for the studied samples before irradiation (1) and after irradiation in vacuum (2) and in air (3).

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6. Fig. 5. Intensities of the absorption band at 1775 cm–1 for the studied samples after their irradiation in air.

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