PSI - Issue 32

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 32 (2021) 131–136

© 2021 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 scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Abstract Separation into surface and subsurface is important when studying complex macromolecular compounds. Investigation of surface-modified materials under application of external load is another challenge. Polyurethane is a phase-separated polymer. It internal structure (stiff fibrils percolating the softer matrix) is covered by a soft nanolayer. Treatment in argon plasma leads to gradual etching and altering the surface and subsurface structures. In first 60 s of the treatment the outer soft layer decreases from 6 to 2 nm becoming stiffer; fibrilar structures are destroyed. After 120 s of the treatment the stiffness and thickness of the coating reaches equilibrium. Cracks were observed in the uniaxial stretched state on the surfaces after treatment < 60 s; the materials with longer treatment show no strain-induced defects. © 2021 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 scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Keywords: polyurethane; plasma treatment; subsurface structure; deformation 1. Introduction Polymers with plasma-modified surface find applications in tribology (Bismarck et al. (2008)), sensors (Onorato et al. (2016)), biomedical products (Vasilev et al. (2011), Pappa et al. (2015), Yoshida et al. (2013)), etc. Plasma significantly alters the physicochemical properties of the polymeric surface: the structure of macromolecules XXIIth Winter School on Continuous Media Mechanics Deformation behavior of polyurethane treated in argon plasma: impact of surface and subsurface properties Ilya A. Morozov a,b,* , Alexander S. Kamenetskikh c , Anton Y. Beliaev a , Roman I. Izumov a a Institute of Continuous Media Mechanics UB RAS, Academika Koroleva st. 1, 614013, Perm, Russia b Perm State University, Bukireva st. 15, 614990, Perm, Russia c Institute of Electrophysics UB RAS, Amundsen st. 106, 620016, Ekaterinburg, Russia

* Corresponding author. Tel.: +7-342-237-83-15; fax: +7-342-237-84-87. E-mail address: ilya.morozov@gmail.com

2452-3216 © 2021 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 scientific committee of the XXIIth Winter School on Continuous Media Mechanics”

2452-3216 © 2021 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 scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.019