Abstract
Abstract : Interfaces formed by curing the polyamic acid (PAA) of pyromellitic dianhydride (PMDA)/2,2-bis(4-(4-aminophenoxy(-phenyl)-hexa-fluoropropane (4- BDAF) polyimide against silver substrates were characterized by x-ray photoelectron spectroscopy (XPS). The C(ls) multiplex spectra of PAA films cured against thick silver films were more similar to those obtained before curing than to those for the bulk PMDA/4-BDAF polyimide, indicating that curing of the polymer was inhibited by interaction of the PAA with the silver substrate. This was evidenced by observing a peak shifted upward by 3.2 eV from the main carbon peak near 284.6 eV which consisted of two overlapping peaks characteristic of the amide and carboxylate groups. Moreover, the main peak observed near 400.4 eV in the N(1s) spectra was attributed to the amides.
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