Model for Solventless PMDA/ODA Polyamic Acid: Consequences for the Reactivity ofPolyamic Acid with Metals

摘要

In this article we discuss the core level spectra of solventless preparedpoly(N,N'-p,p'-oxydiphenylene) pyromellitamic acid) or PMDA/ODA polyamic acid (PAA) films with particular emphasis on the chemical composition and on the 01s and c1s 'shake up' transitions. Both vapor deposited polyamic acid and the resulting polyimide films show an excess of oxydianiline (ODA) and a deficiency of carbonyl groups. A qualitative analysis of the 'shake up' transitions on the 01s and C1s core holes indicate that polyamic acid is in a non-planar conformation. A shoulder in the N1s band at higher binding energy was assigned to positively charged nitrogen and we concluded that a proton is transferred from the amic acid group onto the nitrogen and we concluded that a proton is transferred from the amic acid group onto the nitrogen atom of unreacted oxydianiline. The amic group of the molecule is the primary site of interaction with evaporated gold atoms and with bulk silver surfaces. In the case of polyamic acid and polyimide films on polycrystalline silver the interfacial bonding is achieved via silver carboxylate linkages. Keywords: Polyamic acid, Polymer adhesion, Metal polymer interface, X-ray photoelectron spectroscopy. (JS)