Abstract
AbstractThe molecular structure of interphases formed between thin films of the polyamic acid of pyromellitic dianhydride (PMDA) and oxydianiline (ODA) and silver substrates that were pretreated with m-aminothiophenol (m-ATP) was determined using surface enhanced Raman scattering (SERS) and X-ray photoelectron spectroscopy (XPS). It was found that m-ATP adsorbed dissociatively onto silver substrates through the thiol groups. When thin films of the polyamic acid of PMDA/ODA were spin-coated onto the silver substrates treated with m-ATP, an interphase that was only a few angstroms in thickness was formed in which acid groups of the polyamic acid and amino groups of the m-ATP combined to form ammonium carboxylate species. The bulk of the polyamic acid films was cured to polyimide by immersion in mixtures of acetic anhydride and pyridine or triethylamine but ammonium carboxylate species inhibited curing in the interphase.
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