Improved adhesion for thermoplastic polymers using oxyfluorination

Industrial applications of thermoplastic polymers are often limited by their poor adhesion properties. In this work the effect of surface oxyfluorination on the adhesion properties was investigated for polyethylene (PE), polyoxymethylene (POM), polybutylene terephthalate (PBT) and polyamide 6 (PA6)....

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Bibliographic Details
Published in:Journal of physics. Conference series 2008-03, Vol.100 (1), p.012032
Main Authors: Achereiner, F, Münstedt, H, Zeiler, T
Format: Article
Language:English
Subjects:
Adhesion
Adhesive joints
Adhesive strength
Chemical composition
Contact angle
Fluorination
Fluorine
Free energy
Industrial applications
Photoelectrons
Physics
Polyamide resins
Polybutylene terephthalates
Polyethylenes
Polymers
Shear tests
Surface roughness
Topography
Wettability
White light
X ray photoelectron spectroscopy
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Summary:Industrial applications of thermoplastic polymers are often limited by their poor adhesion properties. In this work the effect of surface oxyfluorination on the adhesion properties was investigated for polyethylene (PE), polyoxymethylene (POM), polybutylene terephthalate (PBT) and polyamide 6 (PA6). The adhesive joint strength was quantified using lap-shear tests. These results were correlated with the changes in the chemical composition of the surface, determined by X-ray photoelectron spectroscopy (XPS), in the surface free energy, measured by the contact angle method, and in the topography, using white-light confocal microscopy. The adhesive strength is strongly improved for all four polymers, but the degree of this increase depends on the polymer type. The surface free energy shows a similar trend for all four polymers. A high surface free energy exceeding 50 mN/m was observed after oxy-fluorination, whereby the polar component was strongly predominant. Surface topography measurements show no significant increase of the surface roughness. So the effect of oxyfluorination results primarily in increased wettability and polarity, due to changes of the chemical composition of the surface. XPS measurements confirm the integration of fluorine and oxygen groups in the polymer chain, which correlates with the increased polarity.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/100/1/012032