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...

Full description

Saved in:
Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-11, Vol.28 (22), p.7574
Main Authors: Zimmermann, Sascha Jan, Moritz, Philipp, Höfft, Oliver, Wegewitz, Lienhard, Maus-Friedrichs, Wolfgang, Dahle, Sebastian
Format: Article
Language:English
Subjects:
Adhesion
Adhesives
Adsorption
Aluminum
Atomic force microscopy
Bond strength
Carbon
DBD plasma
Hydrogen
hydrogen bonding
Hydroxides
Plasma
Plasma physics
PVAc
Radiation
Shear strength
Spectrum analysis
spin coating
thin films
wood
X-ray spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28227574