In the polyimide precursor, in most cases, a metal dopant is added to the polyamic acid solution to obtain a homogeneous solution, and the solution is formed into a film. Finally, imidization, usually thermal cycling, results in a polyimide-metal hybrid material.
In situ polymerization doping
The metal miscellaneous agent is first dissolved in an aprotic polar solvent and then subjected to polycondensation in this solution to give a doped polyamic acid solution. For some systems, this method can improve the doping effect. In addition, in the dianhydride, diamine monomer gas phase co-deposition polymerization doping can also be obtained hybrid film.
The metal dopant is produced in situ by a chemical reaction in solution. For example, some of the silver salt can not be dissolved in DMF, or with polyamide acid produced gel, adding hexafluoroacetylacetone, the formation of Ag, you can overcome the above problems. The unstable dopant H3FeCl6 is also obtained by the reaction of Fe (acac) 3 with HCI. Sometimes in the doped by adding a reducing agent, such as NaBH4 to metal ions into metal elements.