Abstract
The structure and properties of thin films formed by γ-aminopropyltriethoxysilane (γ-APS) adsorbed onto iron, titanium, and aluminum from dilute aqueous solutions is described. γ-APS was adsorbed onto iron and titanium mirrors at pH 10.4 and 8.0 to form siloxane polymers. The structures of the siloxane polymers were only slightly affected by the substrate and the pH. However, the properties of the films as primers for improving the wet strength of iron/epoxy and titanium/epoxy lap joints depended significantly on the substrate and on the pH at which the films were formed. It was concluded that the properties of the films depended more on the orientation of the γ-APS molecules at the oxide surface than on the overall structure of the films. The structure of films formed by γ-APS adsorbed onto aluminum was a strong function of pH. At high pH values, the oxides on aluminum were etched and aluminosiloxane polymers were obtained. At intermediate pH values little etching was observed and siloxane polymers were obtained. The siloxane polymers formed at pH 7.0 inhibited hydration of the native oxide on aluminum in water at 60°C.
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Boerio, F.J., Gosselin, C.A., Williams, J.W., Dillingham, R.G., Burkstrand, J.M. (1985). Structure and Properties of Silane Primers for Adhesive Bonding of Metals. In: Ishida, H., Kumar, G. (eds) Molecular Characterization of Composite Interfaces. Polymer Science and Technology, vol 27. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2251-9_11
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DOI: https://doi.org/10.1007/978-1-4899-2251-9_11
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