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Composite fiber and polymer based flexible composite film and preparation method thereof

A composite fiber and composite film technology, applied in the direction of fiber chemical characteristics, rayon manufacturing, coating, etc., can solve the problems of reduced mechanical flexibility of polymers, high dielectric loss of conductive components, and reduced breakdown field strength, etc., to achieve The effect of increased dielectric constant, excellent dielectric properties, mechanical properties, and improved dielectric constant

Active Publication Date: 2014-04-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to some current studies, the composite of ceramic particles and polymers can increase the dielectric constant of the polymer, but a higher amount of inorganic addition is required to obtain a significantly improved dielectric constant (generally, the volume fraction is greater than 50%), so that The mechanical flexibility of the polymer is greatly reduced, and the defects caused by the excessive addition of inorganic components will also greatly reduce the breakdown field.
For the addition of conductive components, a higher dielectric constant can be obtained at a smaller amount, but the conductive components will produce too high a dielectric loss, and once the content of the conductive components exceeds the percolation threshold, it will make the Composite materials change from insulators to conductors

Method used

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  • Composite fiber and polymer based flexible composite film and preparation method thereof
  • Composite fiber and polymer based flexible composite film and preparation method thereof
  • Composite fiber and polymer based flexible composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, preparation composite fiber

[0045] Weigh 2ml of tetrabutyl titanate and 4ml of acetylacetone into 4ml of ethanol dropwise in sequence, and stir until uniform and stable, then add 1g of barium titanate (BaTiO 3 ) particles (particle size 50nm) continue to stir until uniform and stable, then add 0.4g PVP (addition amount is 0.04g / ml sol, used to adjust the viscosity of the sol to a viscosity value suitable for spinning), and stir for 2 hours to form a stable sol, the sol was transferred to a syringe for electrospinning, the electrospinning was carried out under an electric field of 1.3kV / cm, and the electrospun fibers were collected by rollers and calcined at 500°C for 2h to obtain composite fibers (with a density of 5g / cm 3 ).

[0046] The scanning electron microscope picture of the composite fiber morphology that the present embodiment obtains is as follows figure 1 As shown, among them, figure 1 The scale bar in (a) is 2 μm, figure 1 The scale in (...

Embodiment 2

[0048] Embodiment 2, preparation composite fiber

[0049] Weigh 2ml of tetrabutyl titanate and 4ml of acetylacetone and add them dropwise into 4ml of ethanol in sequence, and stir until uniform and stable, then add 0.5g of barium titanate (BaTiO 3 ) particles (particle size 50nm) continue to stir until uniform and stable, then add 0.4g PVP (addition amount is 0.04g / ml sol) and stir for 2h to form a stable sol, transfer the sol to a syringe for electrospinning, electrospinning The filaments were carried out under an electric field of 1.3kV / cm, and the electrospun fibers were obtained by drum collection, and calcined at 450°C for 2 hours to obtain composite fibers.

[0050] The scanning electron microscope picture of the composite fiber morphology that the present embodiment obtains is as follows figure 2 As shown, among them, figure 2 The scale bar in (a) is 2 μm, figure 2 The scale in (b) is 1 μm. It can be seen from the figure that the diameter of the composite fiber pr...

Embodiment 3

[0052] Embodiment 3, preparation flexible composite film

[0053] Take 0.2 g of the composite fiber prepared in Example 1 and place it in 50 ml of 0.01 mol / L dopamine aqueous solution, stir at 60° C. for 10 h, centrifuge, wash with ethanol and dry at 60° C. for 5 h. Measure 3.5ml of DMF solvent, add 0.018g of the above-mentioned composite fiber, ultrasonic 30min, then add 0.332g of PVDF (density 1.2g / cm 3 ), stirred for 5 hours to a uniform and stable state, then cast the mixture, and dried at 50°C for 2 hours to obtain a film.

[0054] In this embodiment, the high-resolution electron microscope picture of the composite fiber coated with dopamine is as follows: image 3 As shown, it can be seen from the figure that the thickness of the coated dopamine film layer is 3nm.

[0055] The surface scanning electron microscope picture of the composite film prepared in this embodiment is as follows Figure 4 As shown, it can be seen from the figure that the thickness of the composit...

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Abstract

The invention discloses a composite fiber and polymer based flexible composite film and a preparation method thereof. The composite fiber and polymer based flexible composite film comprises a composite fiber and a polymer matrix, wherein the volume percentage of the composite fiber is 1-30%; the composite fiber is composed of an oxide fiber and ceramic particles and / or metal particles embedded in the oxide fiber; the polymer matrix is at least one out of polyvinylidene fluoride, epoxy resin, polyvinylidene fluoride-trifluoroethene, polypropylene, polyethylene terephthalate and polyimide. According to the composite fiber and polymer based flexible composite film disclosed by the invention, the composite fiber and the polymer matrix are compounded, and since additional polarization is introduced into the composite fiber, the polymer based flexible composite film can get a higher dielectric constant under a condition of small adding dosage so as to meet the dielectric performance requirements of the composite material and maintain original related properties of the polymer film, such as mechanical flexibility, to the maximum extent at the same time.

Description

technical field [0001] The invention relates to a composite fiber and a polymer-based flexible composite film and a preparation method thereof, belonging to the technical field of electronic composite material preparation. 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-k 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 (PCBs). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/04C08K7/08C08K3/22C08K3/24C08J5/18B29C41/00D01F9/08D01F1/10
Inventor 沈洋张鑫南策文林元华
Owner TSINGHUA UNIV
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