Abstract
A method for monitoring the degradation of the optical density in films of polytetrafluoroethylene and its modification, a copolymer of tetrafluoroethylene and ethylene, irradiated by electrons with energies of 100 keV and 10 MeV is described. The method is based on measuring the optical density of irradiated films in the photon energy range of 1–6 eV and is confirmed by established “dose–optical absorption” relationships. In particular, using the described method, a completely different nature of the radiation degradation of the optical properties of the two types of films under study was discovered. With an increase in the irradiation dose, “clearing effect” in the region of 2–5 eV and the occurrence of an absorption band at 5.6 eV are observed in polytetrafluoroethylene films. With a similar dose increase, three absorption bands at 4.0, 4.6, and 5.5 eV appear and grow in films of copolymer of tetrafluoroethylene and ethylene. The evidence of the critical role of the optical density of films in the functioning of space technology devices is given.
REFERENCES
Schwarz, R. and Diesendruck, C., Fluorinated polymers: synthesis and applications, in PATAI’S Chemistry of Functional Groups, 2022, pp. 1–22.
Tseentmayer, C., Film fluoropolymers, Polim. Mater., 2018, no. 8, pp. 30–38.
Panshin, Yu.A., Malkevich, S.G., and Dunaevskaya, Ts.S., Ftoroplasti (Fluoroplasts), Leningrad: Khimiya, 1978.
Socci, M.C., Rodríguez, G., Oliva, E., Fushimi, S., Takabatake, K., Nagatsuka, H., Felice, C.J., and Rodríguez, A.P., Polymeric materials, advances and applications in tissue engineering: A review, Bioengineering, 2023, vol. 10, no. 2:218, pp. 1–38.
Skurat, V.E., Changing the integral degree of blackness of fluoropolymer materials in near-Earth space conditions, Fiz.-Khim. Kinet. Gaz Din., 2016, vol. 17, no. 3, pp. 1–10.
Angirasa, D. and Ayyaswamy, P., Review of evaluation methodologies for satellite exterior materials in low earth orbit, J. Spacecr. Rockets, 2014, vol. 51, no. 3, pp. 750–761.
Mezouar, A., Saidi‑Amroun, N., Griseri, V., Teyssedre, G., and Saidi, M., Correlation between chemical, thermal and dielectric properties of gamma-irradiated PTFE thin films, J. Polym. Res., 2023, vol. 30, no. 88, pp. 1–11.
Hao, L.H., Hieu, D.T.T., Luan, L.Q., Phuong, H.T., Dinh, V.P., Tuyen, L.A, Hong, P.T.T., Man, T.V., and Tap, T.D., Electron and gamma irradiation-induced effects in poly(ethylene-co-tetrafluoroethylene) films, J. Appl. Polym. Sci., 2022, vol. 139, no. 29, pp. 1–18.
Zahid, M.A., Kim, S., Jung, I.S., Kang, S.H., Cho, Y.H., Cho, E.C., and Yi, J., The influence of UV light exposure on the reliability of various front materials for lightweight PV, Energies, 2022, vol. 15, no. 9, pp. 1–9.
Mohammadian-Kohol, M., Asgari, M., and Shakur, H.R., Effect of gamma irradiation on the structural, mechanical and optical properties of polytetrafluoroethylene sheet, Radiat. Phys. Chem., 2018, vol. 145, pp. 11–18.
Funding
This work was carried out within the framework of the state assignment of the RF Ministry of Education and Science on topic “Diagnostics,” project no. 122021000030-1, with partial support from the Russian Foundation for Basic Research, project no. 20-38-90239.
Author information
Authors and Affiliations
Corresponding authors
Ethics declarations
The authors of this work declare that they have no conflicts of interest.
Additional information
Publisher’s Note.
Pleiades Publishing remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Vazirova, E.N., Abashev, R.M., Milman, I.I. et al. Optical Testing of Degradation of Films of Polytetrafluoroethylene and Its Modification under Electron Irradiation. Russ J Nondestruct Test 59, 1291–1296 (2023). https://doi.org/10.1134/S1061830923700584
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1061830923700584