AVS 53rd International Symposium
    Applied Surface Science Thursday Sessions
       Session AS-ThM

Paper AS-ThM4
Interfacial Interactions of PEKK Polymer Coatings onto Oxide-free Phosphate Films on an Aluminum Surface

Thursday, November 16, 2006, 9:00 am, Room 2005

Session: Ultra Thin Films and Buried Interfaces
Presenter: P.M.A. Sherwood, Oklahoma State University
Authors: A.L. Asunskis, Oklahoma State University
P.M.A. Sherwood, Oklahoma State University
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In a series of papers we have shown how thin (10nm or less) oxide free phosphate films can be formed on a number of metals. The films formed have potential as corrosion resistant films. We have also shown that it is possible to extend the range of the surface coatings that can be formed by placing a thin polymer layer over the phosphate layer. In this paper we show how the water insoluble polymer poly(ether ketone ketone), PEKK can be placed over a thin oxide free phosphate film on aluminum metal. The surface and the interfaces involved were studied by valence band and core-level X-ray photoelectron spectroscopy (XPS). Difference spectra in the valence band region were used to show that there is a chemical interaction between the PEKK and phosphate thin films on the aluminum metal. Three different phosphate film compositions were studied using different phosphorous containing acids, H@sub 3@PO@sub 4@, H@sub 3@PO@sub 3@, and H@sub 3@PO@sub 2@. This type of interaction illustrates the potential of phosphates to act as adhesion promoters. The valence band spectra are interpreted by calculations.