PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 30 (2020) 105–112

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors The paper presents the results of the IR spectroscopy study of the effect of UV radiation on polyethylene composites containing various climatic stabilizers. These composites are used for storage and transportation of hydrocarbon materials to remote areas of the Republic of Sakha (Yakutia), in which where are both large fluctuations in average annual temperature and a high level of solar radiation. It was found that UV radiation affecting the surface of the composites produces radical reactions with the formation of oxidized products, as well as unsaturated bonds. The following products were detected: carboxylic acids, esters, aldehydes, and compounds containing vinylene and vinylidene groups. It was shown that the number of vinyl groups after irradiation decreases. It has been suggested that a high concentration of vinylidene groups may indicate the effectiveness of the stabilizer against UV radiation. From the comparison of the obtained results with the studies of the features of polyethylene aging under UV radiation described by other authors, it was observed that there is a frequency shift corresponding to the fluctuation of the vinylidene group, which may indicate the formation of cyclic structures. Besides, it was shown that the results are in good agreement with the data obtained during long-term climatic tests of similar composites described in a previous publication by the authors. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords: polyethylene, stabilizers, UV radiation, IR spectroscopy © e P S T a r e ns tt c IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) IR spectroscopy research of the influence of UV radiation on stabilized polyethylene composites Petukhova E.S. and Fedorov A.L.* Institute of Oil and Gas Problems of the Siberian Branch of the RAS - Division of Federal Research Centre “The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences”, Avtodorozhnaya str. 20, Yakutsk, 677007, Russia Abstract

* Corresponding author. Tel.: +79246629045 E-mail address: evgspar@rambler.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of the EURASTRENCOLD - 2020 guest editors

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.018