CONTACT ANGLE TITRATION AND ESCA ANALYSIS OF POLYESTER SURFACES MODIFIED BY FLAME AND CORONA SURFACE TREATMENTS

摘要

Modified surfaces of poly(ethylene terephthalate) (Mylar®) have been studied by surface energetics, ESCA, and surface topographical techniques such as atomic force microscopy (AFM) and optical interference imaging. A new technique applied to this class of systems is described for the very sensitive determination of the surface functional groups in the outer few Angstroms of the surface. pH dependent contact angle analysis is uniquely able to quantify certain chemical species introduced by the various energetic treatments. It is shown that the surface is covered by a low density of carboxylic acid moieties and this coverage can be varied by dose in some instances. ESCA qualitatively supported this, although this technique is not optimum due its lower sensitivity. A comparison is made of the two surface treatments in terms of depth of penetration, roughness, and surface density.