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Polymer nanometer composite material and preparation method thereof

A nano-composite material and polymer technology, which is applied in the field of polymer nano-composite materials and their preparation, can solve the problems of affecting the performance uniformity of the composite material, uneven distribution of particles in the composite material, and reduction of the breakdown field strength of the composite material. Achieve excellent dielectric properties and performance stability, high dielectric constant and breakdown field strength, and improved dispersion

Inactive Publication Date: 2018-11-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, in order to disperse well, most filler particles will be modified with surface modifiers such as dopamine, APS, ethylenediamine, etc. However, the intrinsic breakdown field strength of these modifiers is low, which will lead to the breakdown decrease in penetration
Secondly, the volatilization of the solvent is involved in the process of preparing the composite material by the solution method. If the solvent volatilizes too fast during the preparation process, it is easy to generate pores inside the composite material and affect the quality of the composite material. Therefore, a slower method is used in the general preparation process. The speed is used for the complete volatilization of the solvent, but due to the longer preparation time, the sedimentation phenomenon of the particles in the composite material due to gravity will be more obvious, resulting in uneven distribution of the particles in the composite material, which will affect the medium density of the composite material. electrical properties
Finally, due to the existence of the surface tension of the solvent, the composite material prepared by the solution method may have inconsistencies in the thickness of the edge and the interior, which will lead to the inconsistency of the dielectric properties of different regions of the composite material and affect the uniformity of the composite material properties.

Method used

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  • Polymer nanometer composite material and preparation method thereof
  • Polymer nanometer composite material and preparation method thereof
  • Polymer nanometer composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1, preparation polymer nanocomposite material

[0047] according to figure 1 The schematic flow diagram shown in the preparation of polymer nanocomposites, the specific steps are as follows:

[0048] (1) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, stir until a stable sol is obtained, and obtain a precursor sol; BaTiO 3 Nanoparticles were added to the above P(VDF-HFP) sol to prepare BaTiO 3 Nanoparticles / P (VDF-HFP) sol, stir evenly to steady state, obtain precursor sol (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; BaTiO 3 The amount of nanoparticles added is controlled in the final composite material BaTiO 3 The volume fraction of nanoparticles is 1%).

[0049] (2) The sol was transferred to a syringe for electrospinning, the injection speed was 1.0mL / h, the lateral movement distance was 80mm, the high voltage electric field was 1.3kV / cm, ...

Embodiment 2

[0052] Embodiment 2, preparation polymer nanocomposite material

[0053] according to figure 1 The schematic flow diagram shown in the preparation of polymer nanocomposites, the specific steps are as follows:

[0054] (1) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, stir until a stable sol is obtained, and obtain a precursor sol; BaTiO 3 Nanoparticles were added to the above P(VDF-HFP) sol to prepare BaTiO 3 Nanoparticles / P (VDF-HFP) sol, stir evenly to steady state, obtain precursor sol (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; BaTiO 3 The amount of nanoparticles added is controlled in the final composite material BaTiO 3 The volume fraction of nanoparticles is 5%).

[0055] (2) The sol was transferred to a syringe for electrospinning, the injection speed was 1.0mL / h, the lateral movement distance was 80mm, the high voltage electric field was 1.3kV / cm, ...

Embodiment 3

[0058] Embodiment 3, preparation polymer nanocomposite material

[0059] according to figure 1 The schematic flow diagram shown in the preparation of polymer nanocomposites, the specific steps are as follows:

[0060] (1) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, stir until a stable sol is obtained, and obtain a precursor sol; BaTiO 3 Nanoparticles were added to the above P(VDF-HFP) sol to prepare BaTiO 3 Nanoparticle / P (VDF-HFP) sol, stir evenly and to steady state, obtain precursor sol (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; BaTiO 3 The amount of nanoparticles added is controlled in the final composite material BaTiO 3 The volume fraction of nanoparticles is 10%).

[0061] (2) The sol was transferred to a syringe for electrospinning, the injection speed was 1.0mL / h, the lateral movement distance was 80mm, the high-voltage electric field was 1.3kV / ...

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Abstract

The invention discloses a polymer nanometer composite material and a preparation method thereof. The method comprises following steps: (1) a composite nonwoven fabric of a nanofiller and a polymer matrix is prepared by an electrospinning method; the composite fiber constituting the composite nonwoven fabric has the polymer matrix as a main fiber skeleton, and the nano filler is dispersed in the main fiber; (2) the polymer nanometer composite material can be obtained by hot pressing the composite nonwoven fabric. Compared with the general film forming process, the method of the invention is notonly simpler and more efficient, but also has better uniformity and homogeneity of the prepared composite material. The composite material of the invention can realize the uniform dispersion of the particles of the filler material in the composite material, the surface is smooth, the interior is dense and has no pores, the thickness is uniform and fine controllable in a wide range. At the same time, it has excellent dielectric properties and high performance stability, and is expected to be widely used in dielectric materials.

Description

technical field [0001] The invention belongs to the technical field of electronic composite material preparation, and in particular relates to a polymer nanocomposite material and a preparation method thereof. Background technique [0002] As an important basic electronic component, capacitors account for more than 40% of the electronic component market. In 2011, the global output value of electronic components exceeded 15 billion US dollars. In the field of dielectric materials, with the rapid development of electronic equipment in recent years, widely used Capacitors are developing in the direction of high energy storage, miniaturization and environmental protection. Traditional high dielectric constant dielectric materials are inorganic ceramic materials. Although ceramic dielectric materials have excellent dielectric properties, they require high-temperature sintering during the preparation process and cannot be applied to organic substrates or printed circuit boards (PC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00D04H1/44D01F6/48D01F1/10C08K3/24H01G4/18
CPCC08K3/24D01D5/0038D01F1/10D01F6/48D04H1/44D04H1/728H01G4/18C08L27/16
Inventor 沈洋江建勇张鑫林元华南策文
Owner TSINGHUA UNIV
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