| 摘要 |
Method for preventing spreading of a liquid on a solid surface, e.g., an adhesive placed on a substrate, and for preventing metal migration, in particular silver migration, between conductors deposited on a surface of a substrate, and articles produced by the method. The method comprises application of a layer of polymer having room temperature critical surface tension of wetting less than about 20 dyn/cm, and less than about 0.1 mu m thick, to at least a part of the surface. The polymer layer can be applied by any convenient method, including dipping, spraying, painting, printing, and plasma deposition. A preferred polymer is poly(1H, 1H-pentadecafluorooctyl methacrylate) (PDFOM), which can be advantageously applied in the form of a solution, typically in a fluorinated hydrocarbon such as Freon TM TF, with PDFOM concentration typically between about 0.001% and about 2% by weight. Thin PDFOM layers according to the invention covering the substrate area on which the adhesive is placed later do not unduly decrease the strength of the adhesive bond formed, and have no measurable effect on the electrical conductivity of a conducting adhesive bond. Because of these properties, a substrate surface can be coated with PDFOM, such as by dipping or spraying, and the adhesive be applied to the coated surface. Metal migration is prevented by preventing formation of a continuous electrolyte film, typically an aqueous film, between conductors at different electrical potentials. This can be achieved by coating at least a part of the substrate with the polymer, e.g., PDFOM.
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