Metallized polyimide films: Metallization and mechanism of the process |
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Authors: | E L Vecherkina S K Kudaikulova R M Iskakov B A Zhubanov V Voitekunas J M Abadie |
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Institution: | (1) Bekturov Institute of Chemical Sciences, Academy of Sciences of Kazakhstan, ul. Valikhanova 106, Almaty, 050010, Kazakhstan;(2) Université Montpellier 2 LEMP/MAO, Place Eugene Bataillon, 34095 Montpellier Cedex 05, France |
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Abstract: | The formation of metallized polyimide films in situ, namely, the alkaline hydrolysis of film surfaces, chelation of the modified surface with metal ions, and their chemical reduction giving rise to a metal layer, has been investigated. Initial polyimide films are cast from reaction solutions on a glass substrate. The solutions are prepared through the polycondensation of dianhydride of tricyclo4.2.2.02.5dec-7-ene-3,4,9,10-tetracarboxylic acid and 4,41-diaminodiphenyl oxide in N-methyl-2-pyrrolidone at 160°C. It has been shown that alkaline water-alcohol solutions are optimal media for the hydrolysis of the film surface. The maximal exchange of alkali metal ions is achieved through formation of a more stable metal-ligand complex of poly(amido acid), with the chelation rate depending on the nature of a metal. The metal reduction proceeds rapidly; however, the mechanism of this process depends on the pH of a medium. The annealing of metallized films results in the imidization of poly(amido acid) and in the growth of metal grains on the material surface to yield a metal layer with good optical properties and high conductivity. |
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