Method for preparing high-electric energy density high polymer composite film

Abstract

The invention provides a method for preparing a high-electric energy density high polymer composite film. Hydrochloric acid-doped polyaniline (PANI) is chemically grafted to a molecular chain of polyolefin, a polyurethane (PU) elastomer, epoxy resin (EP) or an acrylic resin elastomer (AE) at first, and a solution casting film-hot pressing method is then utilized to prepare the high-electric energy density high polymer composite film. A chemical method is utilized to graft polyaniline to high polymer, interface bonding strength between two components is improved, the polyaniline particle size is reduced, and furthermore, an interfacial effect between a high polymer basal body and polyaniline particles is fully utilized, so that a composite material with both excellent electrical performance and mechanical performance is obtained. When 50% of ceramic particle is added into a traditional high polymer, the dielectric constant is only about 100; the high polymer-based composite material which is prepared by the method and has the polyaniline content of 12-14% has the dielectric constant of above 380 when the room temperature frequency is 1000Hz; and the electric energy density is above 2.8J / cm<3> in an electric field of 20MV / m.

Description

technical field [0001] The invention relates to a preparation method of a high electric energy density polymer composite film based on a dielectric percolation mechanism, and belongs to the field of high dielectric constant polymer composite materials. Background technique [0002] New dielectric materials with high electrical energy density have important application prospects in the fields of high-power capacitors, drivers, sensors, artificial muscles, medicine, new energy, electronic information, and space technology. Western countries (especially the United States) have invested a lot A large amount of research and development work has been carried out with human and material resources. Materials with high electric energy density need to have high dielectric constant. But so far, no one-component material has been found that has a sufficiently high dielectric constant, good mechanical properties, processability, and low price. Although traditional polymer materials hav...

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Problems solved by technology

[0003] At present, researchers at home and abroad use the physical blending method to prepare such high-energy-density polymer composite materials, that is, to prepare composite materials through simple solution blending or melt blending of conductive components and polymers. However, due to The compatibility between polyaniline and the polymer matrix is ​​poor, and it will aggregate into larger particles in the compound, and it is easy to form a conductive channel in the film, which will increase the dielectric loss of the material, reduce the breakdown electric field, and make the processing heavy. The performance is not good, and the electric energy density of the obtained polymer composite film is less than 1.05J / cm 3