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| - Studies on Polymer−Metal Interfaces. 2. Competitive Adsorptionbetween Oxygen- and Nitrogen-Containing Functionality in ModelCopolymers onto Metal Surfaces
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| - The competitive adsorption behavior between oxygen- and nitrogen-containing functionalityin poly(methyl methacrylate-co-2-vinylpyridine) (MMA2VP) and poly(methyl methacrylate-co-4-vinylpyridine) (MMA4VP) random copolymers onto alumina substrate was investigated. The adhesive strengthof both the MMA2VP/alumina and MMA4VP/alumina systems increased with increasing vinylpyridine(VP) content in the copolymers, and the effect was more prominent for the MMA4VP/alumina system.Analysis of the reflection−absorption infrared spectroscopy shows that the carbonyl functional groups inMMA2VP and MMA4VP interact specifically with alumina while the pyridine rings in VP units areoriented more vertically to alumina surface than carbonyl groups. Results from X-ray photoelectronspectroscopy (XPS) reveal that both the nitrogen-containing functionalities in 2VP or 4VP units and theoxygen-containing functionality in MMA unit interact specifically with alumina surface. The quantitativeanalysis of XPS spectra indicates that the nitrogen-containing functionality adsorbs more favorably ontoalumina surface than the oxygen-containing functionality for both the MMA2VP/alumina and MMA4VP/alumina systems.
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