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Gradient structure polymer nano-composite material and preparation method and application thereof

A technology of nanocomposite materials and gradient structures, which is applied in the field of polymer nanocomposites with gradient structures and its preparation, and can solve problems such as high loss

Active Publication Date: 2019-04-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is also a part of the loss caused by leakage current in the composite material, especially in the case of high volume fraction filler filling
This means that in order to obtain a high dielectric constant and the resulting high energy storage density, it is often accompanied by high loss

Method used

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  • Gradient structure polymer nano-composite material and preparation method and application thereof
  • Gradient structure polymer nano-composite material and preparation method and application thereof
  • Gradient structure polymer nano-composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1. Preparation of Nanofiber Filled Formal Gradient Structure Polymer Nanocomposite

[0058] Follow the steps below to prepare Ba(Zr 0.21 Ti 0.79 )O 3 Nanofibers:

[0059] (1) Measure 1.703g of barium acetate, 1.815g of tetrabutyl titanate, 0.5116g of tetrabutyl zirconate, and 1.34g of acetylacetone into 9ml of acetic acid and stir to dissolve for 1 hour. After completely dissolving, add 0.5 g of polyvinylpyrrolidone and continue to stir for 2 h to obtain a precursor solution.

[0060] (2) Transfer the above precursor solution into a syringe for electrospinning. The injection speed is 1.0mL / h, the high-voltage electric field is 1.3kV / cm, and the fiber is received by the roller. The roller speed is 300rpm, and the fiber is obtained after electrospinning for 10h. non-woven fabric.

[0061] (3) The above-mentioned fiber non-woven fabric is calcined, and the treatment process is as follows: the heating rate is 10°C / min, the temperature is kept at 550°C for 0.5h,...

Embodiment 2

[0068] Example 2, preparation of nano-sheet-filled polymer nanocomposites with trans gradient structure

[0069] Prepare BN nanosheets according to the following steps:

[0070] (1) Take 2g of granular BN raw material and 2g of corundum microspheres respectively and put them into a ball mill jar, and mill for 2 hours.

[0071] (2) After ball milling, remove the corundum microspheres, disperse the ball milled BN in isopropanol, and let stand for 8 hours.

[0072] (3) Centrifuge at 200 rpm, after 30 min, take out the supernatant, and continue to centrifuge at 5000 rpm for 10 min. Place the precipitate in an oven at 80°C and dry to obtain BN nanosheets.

[0073] according to figure 1 The schematic flow diagram shown in the preparation of nanosheet-filled trans-gradient structured polymer nanocomposites, the specific steps are as follows:

[0074] (1) Measure 1g of polymer P(VDF-HFP) (molecular weight: 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, and sti...

Embodiment 3

[0078] Example 3, Preparation of Interpenetrating Gradient Structure Polymer Nanocomposite

[0079] according to figure 1 The schematic flow diagram shown in the preparation of interpenetrating gradient polymer nanocomposites, the specific steps are as follows:

[0080] (1) Measure 1g polymer P (VDF-HFP) (molecular weight is 470,000), join in the mixed solvent of the DMF of 3mL and 2ml acetone, stir to stable sol, obtain polymer precursor sol; Ba( Zr 0.21 Ti 0.79 )O 3 Nanofibers were added to the above P(VDF-HFP) sol to prepare Ba(Zr 0.21 Ti 0.79 )O 3 Nanofiber / P (VDF-HFP) sol, stirring is even with to steady state, obtains polymer composite precursor sol A (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; Ba( Zr 0.21 Ti 0.79 )O 3 The amount of nanofiber added is controlled in the final composite material of Ba(Zr 0.21 Ti 0.79 )O 3 The volume fraction of nanofibers is 10%).

[0081] (2) Measure 1g of polymer P(VDF-HFP) (molecular...

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PUM

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Abstract

The invention discloses a gradient structure polymer nano-composite material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing composite non-woven fabric with a gradient structure by using a modified electrostatic spinning method, wherein the composite non-woven fabric comprises polymer composite nano fibers and / or polymer nano fibers, the polymer composite nano fibers are capable of using a polymer as a main body fiber skeleton, and enabling nano filler to be dispersed in the main body fiber skeleton; and (2) successively performing hot-pressing and heat treatment on the composite non-woven fabric, to obtain the gradient structure polymer nano-composite material. The method is capable of realizing preparation of the gradient structure composite material, and continuous gradient change of the nano filler in the composite material, wherein a gradient direction is adjustable, and the gradient composite material has an excellent dielectric property and extremely high performance stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of electronic composite materials, and in particular relates to a polymer nanocomposite material with gradient structure and its preparation method and application. Background technique [0002] In recent decades, dielectric capacitors, as important electronic components and core energy storage components in high-power systems, are widely used in consumer electronics, automation control, aerospace, military equipment, medical devices and new energy vehicles, etc. field. In 2016, the sales volume of my country's capacitor industry reached 50 billion yuan. Among them, ceramic capacitors, aluminum / tantalum electrolytic capacitors and film capacitors account for more than 90% of the capacitor market. In recent years, electronic devices and energy storage devices are gradually developing in the direction of miniaturization, flexibility and environmental protection. The core material of ceramic c...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/16C08K7/08C08K7/00C08K3/38C08K3/24
CPCC08J5/18C08J2327/16C08K3/24C08K7/00C08K7/08C08K2003/385C08K2201/003C08K2201/004C08K2201/011
Inventor 沈洋江建勇但振康林元华南策文
Owner TSINGHUA UNIV
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