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Article

Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation

1
Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlín, Czech Republic
2
Faculty of Applied Informatics, Tomas Bata University in Zlin, CEBIA-Tech, Nad Stranemi 4511, 760 05 Zlín, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 929; https://doi.org/10.3390/ma13040929
Received: 9 January 2020 / Revised: 7 February 2020 / Accepted: 14 February 2020 / Published: 19 February 2020
(This article belongs to the Special Issue Radiation Effect on Polymeric Materials)
This study’s goal was to describe the influence of a wide range of ionizing beta radiation upon the changes in surface layer mechanical properties and structural modifications of selected types of polymer. Radiation crosslinking is a process whereby the impingement of high-energy electrons adjusts test sample structures, thus enhancing the useful properties of the material, e.g., hardness, wear-resistance, and creep, in order that they may function properly during their technical use. The selected polymers tested were polyolefin polymers like polyethylene (Low-density polyethylene LDPE, High-density polyethylene HDPE). These samples underwent exposure to electron radiation of differing dosages (33, 66, 99, 132, 165, and 198 kGy). After the crosslinking process, the samples underwent testing of the nano-mechanical properties of their surface layers. This was done by means of a state-of-the-art indentation technique, i.e., depth-sensing indentation (DSI), which detects the immediate change in the indentation depth associated with the applied force. Indeed, the results indicated that the optimal radiation dosage increased the mechanical properties by up to 57%; however, the beneficial levels of radiation varied with each material. Furthermore, these modifications faced examination from the structural perspective. For this purpose, a gel test, Raman spectroscopy, and crystalline portion determination by X-ray all confirmed the assumed trends. View Full-Text
Keywords: polymers; crosslinking; electron rays; nano-indentation; X-ray; gel content; spectroscopy polymers; crosslinking; electron rays; nano-indentation; X-ray; gel content; spectroscopy
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MDPI and ACS Style

Ovsik, M.; Manas, M.; Stanek, M.; Dockal, A.; Mizera, A.; Fluxa, P.; Bednarik, M.; Adamek, M. Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation. Materials 2020, 13, 929. https://doi.org/10.3390/ma13040929

AMA Style

Ovsik M, Manas M, Stanek M, Dockal A, Mizera A, Fluxa P, Bednarik M, Adamek M. Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation. Materials. 2020; 13(4):929. https://doi.org/10.3390/ma13040929

Chicago/Turabian Style

Ovsik, Martin, Miroslav Manas, Michal Stanek, Adam Dockal, Ales Mizera, Petr Fluxa, Martin Bednarik, and Milan Adamek. 2020. "Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation" Materials 13, no. 4: 929. https://doi.org/10.3390/ma13040929

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