Preparation method and application of high-dielectric composite film
A composite film, high dielectric technology, applied in the field of materials, can solve the problems of large difference in surface energy, limited improvement of the dielectric properties of materials, and high cost, so as to avoid the generation of conductive channels, improve the dielectric constant, and the dielectric constant. The effect of low electrical loss
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[0021] Specifically, the main steps of the preparation method of the present invention are as follows:
[0022] (a) forming a first polymer film on a substrate;
[0023] In this step, a polymer film can be formed on a substrate made of glass or the like by means of spray coating, spin coating or casting.
[0024] In some preferred embodiments of the present invention, the above forming process includes: dissolving the polymer in an organic solvent, then spraying, spinning or casting the resulting coating to form a film, heating and drying, and cooling to room temperature to form the first coating. A polymer film.
[0025] In some more preferred embodiments of the present invention, the raw material polymers used for the preparation of the first polymer film are: polyvinylidene fluoride-based polymers, polyurea-based polymers, soluble polyimide-based polymers, polyurethane, and poly One or more of vinyl alcohol and other polymers;
[0026] The solvent used to form the coatin...
Embodiment 1
[0048] First, on the cleaned glass substrate, the polyvinylidene fluoride-trifluoroethylene (P(VDF-CTFE)) coating was cast to form a cast film, and dried on a heating table for 12 hours and slowly cooled to At room temperature, the thickness of the film after drying is 3 μm, which is the first polymer film.
[0049] Then, an aluminum layer with a thickness of about 30 nm (measured by a step tester) was formed on the surface of the surface film of the first polymer film by vacuum evaporation.
[0050] Finally, the polyvinylidene fluoride-chlorotrifluoroethylene (P(VDF-CTFE)) coating was cast to form a P(VDF-CTFE) cast film on the surface of the aluminum coating, and dried on a heating table for 12 Hours slowly cooled to room temperature, the thickness of the film after drying was 3 μm, and the total thickness of the double-layer film was 6 μm.
[0051] Embodiment 1 preparation flow process is as figure 1 shown.
Embodiment 2
[0053] On the cleaned glass substrate, the polyvinylidene fluoride-chlorotrifluoroethylene (P(VDF-CTFE)) coating was cast to form a casting film, and dried on a heating table for 12 hours and slowly cooled to room temperature. After drying, the thickness of the film is 20 μm, which is the first polymer film.
[0054] A zinc layer with a thickness of about 50 nm is formed on the surface of the surface film of the first polymer film by vacuum evaporation.
[0055] The polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) coating is cast to form a P (VDF-TrFE) casting film on the surface of the aluminum coating, and it is dried on a heating table for 12 hours and slowly cooled to room temperature. The thickness of the film after drying was 10 μm, and the total thickness of the bilayer film was 30 μm.
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