| Popis: |
C 1s, N 1s and O 1s core spectra were measured for well-cured polyimide films of poly(N,N′-(p,p′-oxydiphenylene)promellitimide), and of poly(p,p′-oxybis(phenylene)-3,3′,4,4′-benzophenonetetracarboxylimide). Resolvable were: multiple C 1s, two N 1s and two O 1s components. A carbonyl deficiency not due to X-ray-induced decarboxylation was detected. Approximately 45% of the surface carbon matrix was found to be comprised of partially oxidized, non-carbonyl-containing moieties of unknown origin. C 1s chemical shift behavior showed that imide bond formation does occur on curing; the imidization reaction in the surface region is incomplete (or altered) based on the changes in the O 1s and N 1s data with increasing temperature of curing. A surface chemical structure inconsistent with the bulk structural formula is observed. |
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