Silver-Polyimide Nanocomposite Films Yielding Highly Reflective Surfaces
COLLEGE OF WILLIAM AND MARY WILLIAMSBURG VA DEPT OF CHEMISTRY
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Highly reflective surface-metallized flexible polyimide films have been prepared by the incorporation of the soluble silver ion complex 1,1,1-trifluoroacetylacetonatosilverI into dimethylacetamide solutions of the polyamic acid prepared from 2,2-bis3,4-dicarboxyphenyl-hexafluoropropane dianhydride 6FDA and 2,2-bis4-4-AMINOPHENOXYPHENYLPHENYLhexafluoropropane 4-BDAF. Thermal curing of solution cast silverI-polyamic acid films leads to cycloimidization of the amic acid with concommitant silverI reduction and formation of a reflective surface-silvered film at 8 and 13 weight percent silver. The metallized films are thermally stable and flexible with mechanical properties similar to those of the parent polyimide. TEM reveals that the bulk interior of the polyimide composite films have 5-20 nanometer-sized silver particles with a surface layer of silver metal ca. 80 nm thick. Neither the bulk nor the surface of the films is electrically conductive. Adhesion of the surface metal to polyimide is excellent.
- Properties of Metals and Alloys