Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood
Wood and aluminum composites are becoming increasingly attractive due to their ability to combine the advantages of both materials: the lightweight nature of wood and the strength of aluminum. However, using conventional wood adhesives like polyvinyl acetate (PVAc) to bond these dissimilar materials...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/22/7574 |
| _version_ | 1797458223660269568 |
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| author | Sascha Jan Zimmermann Philipp Moritz Oliver Höfft Lienhard Wegewitz Wolfgang Maus-Friedrichs Sebastian Dahle |
| author_facet | Sascha Jan Zimmermann Philipp Moritz Oliver Höfft Lienhard Wegewitz Wolfgang Maus-Friedrichs Sebastian Dahle |
| author_sort | Sascha Jan Zimmermann |
| collection | DOAJ |
| description | Wood and aluminum composites are becoming increasingly attractive due to their ability to combine the advantages of both materials: the lightweight nature of wood and the strength of aluminum. However, using conventional wood adhesives like polyvinyl acetate (PVAc) to bond these dissimilar materials is challenging and requires special surface treatments. Prior studies have demonstrated that applying a dielectric barrier discharge plasma treatment significantly enhances shear and bending strengths in beech wood/aluminum bonds. This study focuses on the molecular interactions between PVAc and aluminum or beech wood influenced by plasma surface modification. Surface-sensitive methods, including X-ray photoelectron spectroscopy, infrared reflection adsorption spectroscopy and atomic force microscopy, were employed to characterize the PVAc films on the corresponding surfaces and to identify possible interactions. The ultrathin PVAc films required for this purpose were deposited by spin coating on untreated and plasma-treated aluminum. The aluminum surface was cleaned and oxidized by plasma. Additionally, hydroxyl species could be detected on the surface. This can lead to the formation of hydrogen bonds between the aluminum and the carbonyl oxygen of PVAc after plasma treatment, presumably resulting in increased bond strength. Furthermore, the beech wood surface is activated with polar oxygen species. |
| first_indexed | 2024-03-09T16:34:01Z |
| format | Article |
| id | doaj.art-2316fbd6d9354085b55599403d21ecd9 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T16:34:01Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-2316fbd6d9354085b55599403d21ecd92023-11-24T14:58:18ZengMDPI AGMolecules1420-30492023-11-012822757410.3390/molecules28227574Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and WoodSascha Jan Zimmermann0Philipp Moritz1Oliver Höfft2Lienhard Wegewitz3Wolfgang Maus-Friedrichs4Sebastian Dahle5Clausthal Center for Materials Technology, Clausthal University of Technology, Agricolastrasse 2, 38678 Clausthal-Zellerfeld, GermanyClausthal Center for Materials Technology, Clausthal University of Technology, Agricolastrasse 2, 38678 Clausthal-Zellerfeld, GermanyInstitute for Electrochemistry, Clausthal University of Technology, Arnold-Sommerfeld-Strasse 6, 38678 Clausthal-Zellerfeld, GermanyClausthal Center for Materials Technology, Clausthal University of Technology, Agricolastrasse 2, 38678 Clausthal-Zellerfeld, GermanyClausthal Center for Materials Technology, Clausthal University of Technology, Agricolastrasse 2, 38678 Clausthal-Zellerfeld, GermanyDepartment of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva Ulica 101, 1000 Ljubljana, SloveniaWood and aluminum composites are becoming increasingly attractive due to their ability to combine the advantages of both materials: the lightweight nature of wood and the strength of aluminum. However, using conventional wood adhesives like polyvinyl acetate (PVAc) to bond these dissimilar materials is challenging and requires special surface treatments. Prior studies have demonstrated that applying a dielectric barrier discharge plasma treatment significantly enhances shear and bending strengths in beech wood/aluminum bonds. This study focuses on the molecular interactions between PVAc and aluminum or beech wood influenced by plasma surface modification. Surface-sensitive methods, including X-ray photoelectron spectroscopy, infrared reflection adsorption spectroscopy and atomic force microscopy, were employed to characterize the PVAc films on the corresponding surfaces and to identify possible interactions. The ultrathin PVAc films required for this purpose were deposited by spin coating on untreated and plasma-treated aluminum. The aluminum surface was cleaned and oxidized by plasma. Additionally, hydroxyl species could be detected on the surface. This can lead to the formation of hydrogen bonds between the aluminum and the carbonyl oxygen of PVAc after plasma treatment, presumably resulting in increased bond strength. Furthermore, the beech wood surface is activated with polar oxygen species.https://www.mdpi.com/1420-3049/28/22/7574spin coatingthin filmsDBD plasmaPVAchydrogen bondingwood |
| spellingShingle | Sascha Jan Zimmermann Philipp Moritz Oliver Höfft Lienhard Wegewitz Wolfgang Maus-Friedrichs Sebastian Dahle Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood Molecules spin coating thin films DBD plasma PVAc hydrogen bonding wood |
| title | Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood |
| title_full | Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood |
| title_fullStr | Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood |
| title_full_unstemmed | Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood |
| title_short | Characterization of Molecular Interactions in the Bondline of Composites from Plasma-Treated Aluminum and Wood |
| title_sort | characterization of molecular interactions in the bondline of composites from plasma treated aluminum and wood |
| topic | spin coating thin films DBD plasma PVAc hydrogen bonding wood |
| url | https://www.mdpi.com/1420-3049/28/22/7574 |
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