Polyimide/metal composite films via in situ decomposition of inorganic additives: Soluble polyimide versus polyimide precursor

Abstract

Polyimide-metal oxide (Co304 or CuO) composite films have been prepared via in situ thermal decomposition of cobalt (II) chloride or bis (trifluoroacetylacetonato) copper (II). A soluble polyimide (XU-218) and its corresponding prepolymer (polyamide acid) were individually employed as the reaction matrix. The resulting composites exhibited a greater metal oxide concentration at the air interface with polyamide acid as the reaction matrix. The water of imidization that is released during the concurrent polyamide acid cure and additive decomposition is believed to promote metal migration and oxide formation. In contrast, XU-218 doped with either HAuCl4 • 3H2O or AgNO3 yields surface gold or silver when thermolyzed (300 °C).

Control of Reflectivity and Surface Conductivity in Metallized Polyimide Films Prepared via in Situ Silver(I) Reduction

“…Such a surface overlayer is suggested by two observations: (1) the XPS spectra Table show a high atom percentage of carbon, oxygen, and nitrogen at the film surface for the 12.0% film cured only to 300 °C in roughly the ratios expected for pure BTDA/4,4‘-ODA and (2) our nonconductive silvered films show virtually no tendency to tarnish under ambient conditions for periods of more than 1 year. There are also a limited number of references to the formation of an overlayer in polyimide films with gold, copper, and cobalt oxide surfaces prepared via self-metallization procedures. We are currently looking in more detail at the possibility of polymer overlayers on these in situ silver metallized films.…”

Fabrication of Highly Reflective Composite Polyimide Films via in Situ Reduction of Matrix Constrained Silver(I)

“…Finally, there is precedent for an overlayer with metallized polyimide films. Reports of overlayers on polyimide films with gold, copper, and cobalt oxide surfaces prepared via in situ metallization procedures have appeared. Also consistent with the presumption of an overlayer contributing to a diminution of reflected light is the fact that surface-conductive silver(0) films that we have prepared with other bidentate ligands do not show any decrease in reflectivity with increasing angle of incidence .…”

Polyimide−Ceramic Hybrid Composites by the Sol−Gel Route

“…In some of the earlier studies (before 1990), the incorporation of metal oxides was frequently not very successful, yielding inhomogeneous distributions of particles (markedly higher concentrations at or near the polymer surfaces. − ) In many cases, agglomeration of the inorganic particles degraded the properties of the resulting materials. In 1990, however, McGrath and co-workers reported the synthesis of functionalized PI oligomers capable of bonding themselves into sol−gel networks.…”