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193results about How to "High dielectric constant" patented technology

Composite dielectric material, copper-clad foil prepreg manufactured and copper-clad foil laminated board by using composite dielectric material

The invention discloses a composite dielectric material, a prepreg manufactured and a copper-clad foil laminated board by using the composite dielectric material, wherein the composite dielectric material comprises the components by mass percent: 4-30% of bismaleimide compound, 7-30% of cyanate ester monomer, 2-20% of epoxy resin, 2-20% of allylphenol compound, 0.5-5% of catalyst and 30-80% of inorganic filler, wherein the inorganic filler is high-dielectric oxide and/ or conductive particles, and can be evenly dispersed in organic matrix by surface grafting or surface coating modification; the prepreg manufactured by the composite dielectric material can be obtained by coating the composite dielectric material on the surface of copper foil and carrying out heat treatment at 80-100 DEG C. The copper-clad foil laminated board is obtained by laminating the prepreg at the temperature of 120-200 DEG C. The copper-clad foil laminated board has the excellent characteristics of high glass transition temperature, high dielectric constant, low dielectric loss, high peel strength and the like, thus being used for manufacturing a high-temperature resistant embedded capacitor printed circuit board (PCB).
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI

Preparation method of conductive macromolecule non-covalent functionalized graphene modified electrokinetic energy conversion polymer material

InactiveCN105461948AImprove dispersionHigh dielectric constantCvd grapheneUltrasonic assisted
The invention discloses a preparation method of a conductive macromolecule non-covalent functionalized graphene modified electrokinetic energy conversion polymer material. according to the method, conductive macromolecules are non-covalent functionalized onto the surface of nano-graphene; and then, the conductive macromolecule non-covalent functionalized graphene nano-material undergoes ultrasonic-assisted dispersion into an electrokinetic energy conversion polymer solution so as to finally obtain a conductive macromolecule non-covalent functionalized graphene/electrokinetic energy conversion polymer composite material. The electro-stimulate response intelligent polymer composite material obtained by the method has high dielectric constant and high electrodeformation value. When content of poly(3,4-ethylenedioxythiophene): polystyrolsulfon acid non-covalent functionalized graphene nanofiller is 3%, dielectric constant of the modified polyurethane dielectric elastomer intelligent material reaches up to 350 at room temperature and at the frequency of 1000 Hz, dielectric loss is 0.20, and loss modulus is 200 MPa. Under the action of a 32.2 MV/m electric field, electrodeformation value in the thickness direction reaches 162%. Performance of the material provided by the invention is far more excellent than performance of a regular nano-ceramic or nano-conductive filler modified intelligent polymer composite material.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

High-voltage-resistant and high-energy-density capacitor and preparation method thereof

The invention relates to a high-voltage-resistant and high-energy-density capacitor and a preparation method thereof. The high-voltage-resistant and high-energy-density capacitor comprises a substrate, a bottom electrode, a dielectric layer and a top electrode, wherein Si or SiO2/Si is taken as the substrate; the bottom electrode is a metal film, a conductive oxide film or a combination of both; the dielectric layer consists of a BaTiO3 ferroelectric film; and the top electrode is a metal film point electrode. A metal target or/and conductive oxide target is adopted, and a single target is used for depositing a metal film or a conductive oxide film, or depositing the meal film and the conductive oxide film in sequence on the substrate in a radio-frequency or direct current magnetron sputtering way; a ceramic BaTiO3 target is adopted, and a BaTiO3 layer is deposited on the bottom electrode in a radio-frequency magnetron sputtering way; and a metal target is adopted, and the top electrode is deposited in a radio-frequency magnetron sputtering way. The film capacitor prepared with the method has the advantages of small size, high voltage resistance and breakdown field strength Eb of higher than 1000kV/cm; the practical discharging energy density is not less than 10J/cm<3>; and the loss is low, and the dielectric performance is kept stable when the frequency and temperature change.
Owner:欧阳俊

Double-layer structure flexible piezoelectric film with high output, preparation and application method thereof

ActiveCN108530806AHigh dielectric constantHigh polarizationPiezoelectric/electrostrictive device material selectionPolyvinylidene fluorideMagnesium
Belonging to the field of electronic composite materials and nano-functional materials, the invention provides a double-layer structure flexible piezoelectric film with high output, a preparation andapplication method thereof. A layer-by-layer solution spin coating-heat treatment process is adopted, an inorganic piezoelectric material is used as the filler to enhance the piezoelectric output of the composite film, and the double-layer structure is utilized to acquire high output and good mechanical properties at the same time. The inorganic filler is nanoparticles or nanofiber of barium titanate, barium strontium titanate, lead zirconate titanate and other piezoelectric ceramics, or nanoparticles or nanofiber of magnesium oxide, zinc oxide and other metal oxides, or multiwalled carbon nanotube. The polymer matrix can be polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polyvinylidene fluoride-trifluoroethylene-hexafluoropropylene and other materials. By adjusting thefiller content and the filler distribution in the double layers, the filler efficiency can be improved. The composite material has the characteristics of good flexibility, high piezoelectric output,high sensitivity and light weight, and can be used as a power supply of wearable equipment, as a flexible sensor to detect human activities and the like.
Owner:UNIV OF SCI & TECH BEIJING

Carbonyl-containing material-coated barium titanate/polymer composite film and preparation method thereof and application

ActiveCN105367811AGuaranteed flexibilityHigh dielectric constantSolventElectric breakdown
The invention discloses a carbonyl-containing material-coated barium titanate/polymer composite film and a preparation method thereof and application. The carbonyl-containing material-coated barium titanate/polymer composite film is prepared through the following method which comprises a step 1) of mixing dispersion liquid of nanometer barium titanate and a carbonyl-containing material, and obtaining composite nanoparticles coating the carbonyl-containing material; a step 2) of dispersing the composite nanoparticles coating the carbonyl-containing material into polymer composited solution, and obtaining mixed dispersion liquid; a step 3) of causing the mixed dispersion liquid in the step 2) to undergo tape casting, removing a solvent to form a film, and then causing the film to undergo hot pressing and cooling to obtain the carbonyl-containing material-coated barium titanate/polymer composite film. The carbonyl-containing material-coated barium titanate/polymer composite film can achieve high dielectric constant (30 or above), high electric breakdown strength (250 MV/m or above) and high discharge density are guaranteed, and the flexibility of the capacitor composite film is maintained. The carbonyl-containing material-coated barium titanate/polymer composite film is applied to the preparation of a flexible electronic device.
Owner:TSINGHUA UNIV

Polymer composite material embedded microcapacitor and preparation method thereof

The invention relates to a polymer composite material embedded microcapacitor and a preparation method thereof, belonging to the technical field of the novel microelectronic material and element. The microcapacitor comprises an upper electrode, a dielectric film and a lower electrode which are stacked in turn, wherein the dielectric film is prepared from polyimide/barium titanate (PI/BT) composite material. The method of the invention comprises the following steps: adopting the in-situ polymerization method to disperse BT nanoparticles in PI and prepare the PI/BT composite material of the dielectric film; adopting the casting method to stick the PI/BT composite material to a copper plate substrate, coating a layer of photoresist on the obtained dielectric film, performing ultraviolet exposure according to a template drawing to obtain patterned photoresist; sputtering a metal layer on the dielectric film and photoresist; soaking in acetone solution to form the patterned upper electrode; performing RIE treatment in the mixed gas of oxygen and trifluoromethane, and cleaning with ultrasonic wave to obtain the microcapacitor. By using the method of the invention, the uniform and dense dielectric film with large area can be obtained; and the microcapacitor can work stably at a higher temperature or a lower temperature.
Owner:TSINGHUA UNIV +1

Lead barium niobate sodium-based glass ceramic material with high energy density, and preparation method thereof

The invention relates to a lead barium niobate sodium-based glass ceramic material with high energy density, and a preparation method thereof. The ceramic particles are mainly prepared from the components: perovskite-phase NaNbO3 and tungsten bronze-phase Ba2NaNb5O15. The glass ceramic energy storage material is prepared from the chemical components meeting a chemical general formula of 6.4Na2CO3-23.04BaCO3-2.56PbO-32Nb2O5-36SiO2. The preparation method comprises the steps of adopting Na2CO3, BaCO3, PbO, Nb2O5 and SiO2 as raw materials, rolling and mixing, drying, then melting at high temperature to obtain a glass melt; quickly pouring the high-temperature melt into a preheating mold, preserving heat for multiple hours in a constant-temperature furnace body so as to remove residual stressin quenching glass, and then cutting a glass block into glass slices with equal sizes and thicknesses; carrying out controlled crystallization on the glass slices, and obtaining the glass ceramic energy storage material. The lead barium niobate sodium-based glass ceramic energy-storage material is applied to an energy-storage capacitor material. Compared with the prior art, the ceramic energy-storage material prepared by the invention has the advantages of high dielectric constant and energy density, wide heat treatment temperature range and the like.
Owner:TONGJI UNIV
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