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

A technology of electric energy density and composite film, which is applied in the field of preparation of high electric energy density polymer composite film, can solve the problems of poor compatibility, reduced breakdown electric field, poor processing reproducibility, etc., and achieves the effect of good flexibility

Active Publication Date: 2013-05-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Dissolve 1.2g of polyvinylidene fluoride (PVDF) in 15mL of NMP, and use O in an oil bath at 25°C 3 / O 2Mixed gas, the flow rate is 0.5L / min, and the ozone yield is 1.0 g / h. After ozonation treatment, add 0.6g hydroxyethyl methacrylate, stir evenly, vacuumize, blow nitrogen, and react in an oil bath at 70°C After 5 hours, distill under reduced pressure, remove the solvent, and place in a 70°C oven for 12 hours to obtain polyvinylidene fluoride (PVDF) with active hydroxyl groups on the molecular chain. Dissolve 1.0g of the above-mentioned chemically modified polyvinylidene fluoride (PVDF) in 9.0ml of N,N-dimethylformamide (DMF), protect with nitrogen gas, stir well, add 0.15g of toluene diisocyanate dropwise, at 65°C React in an oil bath for 2 hours, then add 0.15 g of hydrochloric acid doped polyaniline to continue the reaction for 5 hours, then stop, separate and purify, and obtain a grafted product after vacuum drying. When preparing the composite film, we...

Embodiment 2

[0026] Example 2: Dissolve 1.6g of vinylidene fluoride-trifluoroethylene-chlorofluoroethylene terpolymer [P(VDF-TrFE-CFE)] in 20ml DMSO, after ozonation treatment in an oil bath at 25°C, add 0.8g hydroxyethyl methacrylate, stir evenly, blow nitrogen, react in 70°C oil bath for 5 hours, distill off the solvent under reduced pressure, and dry in vacuum to obtain vinylidene fluoride-trifluoroethylene with active hydroxyl groups on the molecular chain - Chlorofluoroethylene terpolymer [P(VDF-TrFE-CFE)]. Dissolve 1.2g of the above-mentioned chemically modified vinylidene fluoride-trifluoroethylene-chlorofluoroethylene terpolymer [P(VDF-TrFE-CFE)] in 10.0ml N, N-dimethylformamide DMF, blow nitrogen Protected, stirred evenly, added dropwise 0.18g of toluene diisocyanate, reacted in an oil bath at 65°C for 2 hours, then added 0.18g of hydrochloric acid doped polyaniline to continue the reaction for 5 hours, then stopped, separated and purified, and vacuum dried to obtain a grafted pro...

Embodiment 3

[0027] Example 3: Dissolve 1.72g of isocyanate functional group-terminated polyurethane (PU) elastomer in 30ml of DMF, stir well to completely dissolve the polyurethane (PU), then add 0.25g of hydrochloric acid to dope polyaniline, and store at 65°C under nitrogen protection Reflux in an oil bath for 10 hours, distill off the remaining solvent under reduced pressure, and dry under vacuum to obtain the grafted product. When preparing the composite film, the graft was weighed and added to a small beaker containing DMF, so that the concentration of the resulting solution was 6 wt%. After ultrasonic treatment for 4 hours, the solution was dropped onto a glass slide for natural leveling. Heated in an oven at 70°C for 5 hours to remove the solvent, vacuumed for 12 hours to remove the residual solvent, then peeled off the obtained film, folded twice and placed in a mold with a press at 20MPa pressure and 120°C for thermocompression molding, and finally Continue annealing at 120°C for...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L87/00C08G18/64C08G18/62C08G81/00C08J5/18B29C51/10
Inventor 王经文李淑秦
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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