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Multiple-sample approach: reliable ranking and validated statistics of bonding and adhesive strength
(2014)
Bonding strength of adhesive-bonded joints and adhesive strength of coatings have been exclusively determined in
single-sample tests using a tensile testing machine. Necessarily, the single-sample approach was also applied to the
corresponding bonding procedure. As a consequence, reliability and reproducibility of results were restricted. By
applying the newly introduced centrifuge technology, the multiple-sample approach was realized for simultaneous
tensile testing of up to eight samples under identical conditions without any disturbing shear-force effects. In order to
introduce the multiple-sample approach into the bonding procedure, a hydraulic bonding set-up was developed which
enables identical bonding pressure also for slightly different heights of sample assemblies. Both sample approaches
were compared for various application examples: ranking of different classes of adhesives, validated statistics of
adhesive-bonded joints using one particular adhesive and effects of cleaning and plasma-treatment on the adhesive
strength of coatings. The investigated systems included glass, metals and polymer substrates, different adhesives,
metallic and dielectric coatings on polymers.
Multiple-sample approach: reliable ranking and validated statistics of bonding and adhesive strength
(2014)
Bonding strength of adhesive-bonded joints and adhesive strength of coatings have been exclusively determined in single-sample tests using a tensile testing machine. Necessarily, the single-sample approach was also applied to the corresponding bonding procedure. As a consequence, reliability and reproducibility of results were restricted. By applying the newly introduced centrifuge technology, the multiple-sample approach was realized for simultaneous tensile testing of up to eight samples under identical conditions without any disturbing shear-force effects. In order to introduce the multiple-sample approach into the bonding procedure, a hydraulic bonding set-up was developed which enables identical bonding pressure also for slightly different heights of sample assemblies. Both sample approaches were compared for various application examples: ranking of different classes of adhesives, validated statistics of adhesive-bonded joints using one particular adhesive and effects of cleaning and plasma-treatment on the adhesive strength of coatings. The investigated systems included glass, metals and polymer substrates, different adhesives, metallic and dielectric coatings on polymers.
Zur Verbesserung der Verbundfestigkeit kann beim Kleben [1] oder Beschichten von Polymeren die Oberfläche mittels 02-Plasma gereinigt (Feinstreinigung) und aktiviert werden. Bei der Plasmaaktivierung werden sauerstoffhaltige funktionelle Gruppen auf der Oberfläche gebildet.
Die Polymersubstrate wurden mit 02-Plasma behandelt, zum einen mit einem Plasmajet bei 200 W (PP, PA) und zum anderen mit einem Mikrowellenplasma bei 100 W (Folie: PE, PP, PS, PC, PET), mittels FTIR-Spektroskopie (p-ATR) charakterisiert sowie die Änderung der Oberflächenenergie mittels Kontaktwinkelmessung bestimmt.
Die Plasma-Kompatibilität von Partikeln ist eine Voraussetzung für die Anwendung in Plasmadispersionsschichten. Das Ziel ist die Realisierung von add-on Funktionen auf Oberflächen, in Folien und in Beschichtungen. Obwohl primär Nanopartikel für die beabsichtigten Anwendungen verwendet werden, wurden die Kompatibilitättests zuerst mit Partikeln im unteren Mikrometerbereich durchgeführt, um auf einfache Weise Degradationseffektes des Materials, der Fluoreszenzmarkierung oder der Oberfläche zu untersuchen.