Date Awarded

1997

Document Type

Dissertation

Degree Name

Doctor of Philosophy (Ph.D.)

Department

Applied Science

Advisor

Robert A Orwoll

Abstract

Optically reflective polyimide films have been prepared by the incorporation of silver(I) acetate and a {dollar}\beta{dollar}-diketone solubilizing agent, hexafluoroacetylacetone (HFAH), into a dimethylacetamide solution of the poly(amic acid) formed from {dollar}3,3\sp\prime,4,4\sp\prime{dollar}-benzophenonetetracarboxylic acid dianhydride (BTDA) and {dollar}4,4\sp\prime{dollar}-oxydianiline {dollar}(4,4\sp\prime{dollar}-ODA). Optically reflective and conductive polyimide films have been prepared by replacing the {dollar}\beta{dollar}-diketone (HFAH), with the less substituted {dollar}\beta{dollar}-diketone, trifluoroacetylacetone (TFAH). The former system has been both cast directly from the poly(amic acid) resin and cast from the poly(amic acid) resin onto a fully imidized {dollar}\rm BTDA/4,4\sp\prime{dollar}-ODA base (forming a metallized topcoat). Thermal curing of the silver(I)-containing poly(amic acid) leads to imidization with concomitant silver(I) reduction, yielding a reflective silver surface, when HFAH is the solubilizing agent, and a reflective and surface-conductive silver surface, when TFAH is the solubilizing agent. The metallized {dollar}\rm BTDA/4,4\sp\prime{dollar}-ODA films retain the essential mechanical properties of undoped films and have good thermal stability particularly in nitrogen atmospheres. The system which forms a metallized topcoat also exhibits the essential mechanical and thermal properties of the parent polymer while minimizing the silver required to form the reflective surface, and has outstanding metal-polymer and polymer-polymer adhesion attributed to mechanical interlocking. Films were characterized by X-ray, DSC, TGA, XPS, TEM, SEM, AFM.

DOI

https://dx.doi.org/doi:10.21220/s2-hrp9-pk45

Rights

© The Author

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