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Article

Influence of the β Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins

1
Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlin, Czech Republic
2
Faculty of Applied Informatics, Tomas Bata University in Zlin, CEBIA-Tech, Nad Stranemi 4511, 760 05 Zlin, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2021, 14(1), 76; https://doi.org/10.3390/ma14010076
Received: 25 November 2020 / Revised: 21 December 2020 / Accepted: 23 December 2020 / Published: 25 December 2020
(This article belongs to the Special Issue Radiation Effect on Polymeric Materials)
The goal of this research was to examine the effect of two surface modification methods, i.e., radiation cross-linking and plasma treatment, on the adhesive properties and the final quality of adhesive bonds of polypropylene (PP), which was chosen as the representative of the polyolefin group. Polymer cross-linking was induced by beta (accelerated electrons—β) radiation in the following dosages: 33, 66, and 99 kGy. In order to determine the usability of β radiation for these applications (improving the adhesive properties and adhesiveness of surface layers), the obtained results were compared with values measured on surfaces treated by cold atmospheric-pressure plasma with outputs 2.4, 4, and 8 W. The effects of both methods were compared by several parameters, namely wetting contact angles, free surface energy, and overall strength of adhesive bonds. Furthermore, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) were conducted. According to our findings the following conclusion was reached; both tested surface modification methods significantly altered the properties of the specimen’s surface layer, which led to improved wetting, free surface energy, and bond adhesion. Following the β radiation, the free surface energy of PP rose by 80%, while the strength of the bond grew in some cases by 290% in comparison with the non-treated surface. These results show that when compared with cold plasma treatment the beta radiation appears to be an effective tool capable of improving the adhesive properties and adhesiveness of PP surface layers. View Full-Text
Keywords: adhesion; radiation cross-linking; wetting contact angle; free surface energy; bonded joints; polypropylene; β radiation; plasma treatment adhesion; radiation cross-linking; wetting contact angle; free surface energy; bonded joints; polypropylene; β radiation; plasma treatment
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MDPI and ACS Style

Bednarik, M.; Mizera, A.; Manas, M.; Navratil, M.; Huba, J.; Achbergerova, E.; Stoklasek, P. Influence of the β Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins. Materials 2021, 14, 76. https://doi.org/10.3390/ma14010076

AMA Style

Bednarik M, Mizera A, Manas M, Navratil M, Huba J, Achbergerova E, Stoklasek P. Influence of the β Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins. Materials. 2021; 14(1):76. https://doi.org/10.3390/ma14010076

Chicago/Turabian Style

Bednarik, Martin, Ales Mizera, Miroslav Manas, Milan Navratil, Jakub Huba, Eva Achbergerova, and Pavel Stoklasek. 2021. "Influence of the β Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins" Materials 14, no. 1: 76. https://doi.org/10.3390/ma14010076

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