Poly ESCA spectra

The surface grafting of a commercial sheet of poly(ethylene tere-phtalate) was analyzed by ESCA spectra and dye adsorption. The sheets were washed with acetone to remove impurities and then grafted by irradiation for 2 and 20 min. (Figure 9). The blank sample showed no Nls peak in the ESCA spectrum. After grafting the Nls peak increased with increasing grafting time. 

Figure 6. Change in sulfur 2p ESCA spectrum of poly-PTS...

Fig. 10.98. The well-defined doublet of the ESCA spectrum of the Oj, core level of poly(methyl methacrylate) [1823]. (Reproduced with permission from Ratner, B.D., in Polymers in Medicine II (eds Chiellini, E. et al) published by Plenum Press, NY, 1986.)... 

X-Ray photoelectron spectroscopy (XPS) or ESCA is another routine analytical technique whose application to CPs is best illustrated by examples. Wide-spectrum XPS is a simple tool for elemental analysis, useful, e.g., to see the presence of an atom belonging to a particular dopant to verify doping. Higher resolution (core-level) XPS is typically useful for determining oxidation states of a central heteroatom, e.g. the N-atom in poly(aromatic amines), hence elucidating the redox state of the polymer or at least of the central heteroatom. Finally, valence-level spectra, at very low energies, have been said to be usable for estimation of density of states, although their accuracy is questionable. 

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